It wasn't long ago that there were real concerns around the level of depth in the Irish squad.
We won't get the final answer to that question until the World Cup, but this Six Nations campaign has dropped a few hints that Ireland have more options than ever, and a healthy set of reserves to fall back on.
With so many injuries dotting their way around the campaign, 32 different players saw game time over the five matches, with 26 of those starting at least once.
There's never been a competition won that hasn't been credited to the entire "squad effort", but it rings true for Ireland's Grand Slam success.
A mark of the title win has been the amount of juice Andy Farrell has been able to squeeze from his replacements, who have added to performance in every game they have played.
"All I want to do is make an impact when I get the chance and I back my skill set," said Jack Conan after the 29-16 win against England.
The Leinster backrow featured in all five games, four of which came from the bench, making significant contributions at crucial stages against France, Scotland and England, with his hard running and offload to Dan Sheehan playing the hooker in for Ireland's third try (below) of the night on Saturday.
"I feel good, I feel fit and I was ready to make an impact and I'm happy I was able to do something when I got on.
"The boys had done great for 60 minutes but it was great to get a bit of time on the pitch and add to the momentum and the scoreline."
Conan, who has been keeping Gavin Coombes and Nick Timoney out of the matchday squad during this championship, says the queue of players waiting to get in is heightening the competitiveness of the group.
"Yeah they've been class, it's shown the strength in depth of the squad and the players that have been picked by the coaching staff, just how good we are and the talent that's in the country at the moment.
"There's loads of other lads who could have stepped up and played and if some people hadn't been fit we still would have got the job done."
At hooker, Rob Herring came off the bench on Saturday to cap off Ireland's title with the bonus point try, a nice reward for the Ulsterman, who saw his only start of the campaign ended by a head injury, for which France prop Uini Atonio was ultimately suspended.
"It's hard to put into words," Herring (below) said on Saturday evening.
"The whole week, the build up to it, we really did feel how special it was going to be. The energy in Dublin this week, the way to the stadium, the answers, even when things weren't going right the crowd were there picking us up. I've never experienced anything like this.
When the stock room is full, Herring is realistically third choice behind Dan Sheehan and Rónan Kelleher, but with both players having had to deal with injuries in over the course of the five games, he says he knows opportunities to play will present themselves.
"The coaches are straight up with the players, we know where we stand. The other guys came in and took their chances and I just had to be patient and wait for my chance.
"Unfortunately Rónan was injured this week so I got an opportunity.
"We have a great squad, everyone mucks in during the week and prepares the team.
"To come on and be able to do that, it comes from everyone doing their job well. It's about enjoying those big moments and we did towards the end of the game there," he added.
The biggest questions around Ireland's depth in the last two seasons have been around what happens if Tadhg Furlong and Johnny Sexton get hit with an injury.
In Furlong's absence, Finlay Bealham was outstanding, and despite missing the last two games due to injury, he would be in the mix for a Team of the Championship, while Tom O'Toole has produced his best rugby in an Irish shirt across the last six weeks.
Ross Byrne (above) was an unexpected arrival back into the Irish squad in November, and is now leading the race to inherit the 10 jersey next year when Sexton retires.
"I actually got incredibly emotional when I got my hands on the trophy," Byrne said after winning his first Six Nations title.
"I suppose there were times when I thought I'd never be here again and to be here, it's really, really special.
The 27-year-old came off the bench four times, with particularly strong cameos versus Wales and France, while he was also solid as a starter in the Round 3 win against Italy in Rome.
And while Ireland's bench players have received high praise during the Grand Slam journey, Byrne says that praise extends further than the matchday 23.
"Yeah, well the whole squad, I don't know how many players we used, obviously we lost three players last week but before that we lost lads through the campaign and the squad effort has been absolutely incredible, and not only those here on the pitch but the lads who didn't get to play as well, the effort they put in in training."
