Derek McGrath says that the most cohesive teams are the ones that know their jobs inside and out.

Speaking on this week's RTÉ GAA Podcast the former Waterford manager added that sometimes a manager throwing in something unpredictable can make it more difficult for players to know their role.

The panel were discussing the value of changing up teams ahead of big games, with Clare seen as having a settled team, while Kilkenny, under Brian Cody, can always throw up a surprise inclusion.

"The two most cohesive teams are Clare and Limerick," McGrath said in a discussion about this weekend's All-Ireland SHC semi-finals at Croke Park.

"They know who they have, they know their systems, they know how to play, so everyone can spring a surprise.

"Anecdotally, there's a history of unpredictability here, and I'm only speculating, but I'm reading that he [Cody] goes on training. If I'm picking the Kilkenny team Pádraig Walsh is there because he's one of my best players.

"You've fellas that if they're right they're playing no matter how they're going in training.

"I was watching Pádraig Walsh getting six points off Tadhg de Búrca in the last round of the league and I'm thinking he's going to be a stalwart of this Kilkenny team for the whole championship season.

"I accept a fella's form can drop, but the balance between a fella's form dropping and putting in the guy who is going well in training... Over the years you might look to the bench and say that, 'Austin Gleeson at 70% is better than what is on the bench at 100%.'

"I was reading a bit about the most cohesive teams in soccer, rugby, GAA and American football. The most cohesive teams are the ones that know their systems of play, and the personnel are nearly the same the same the whole way through."

Speaking on the same episode former Tipperary goalkeeper Brendan Cummins argued that it's a testament to the loyalty that Brian Cody can demand that his panel stays with him, even if it means keeping some big names in reserve.

"Brian Cody's rationale is, 'what is the size of the bite in the dog'," says Brendan Cummins.

"That's what he looks at. If there's a fella in training who loses the hurley and blocks a fella down with his hands instead of going back for his hurley, that's the raw material that he wants.

"I'm not saying Pádraig Walsh doesn't fight enough. We don't know what's going on in training. He's [Cody] the only manager I know of who'd leave off the top players and there's no row about it. The team just gets on with the job and wins the match.

"If we left off Eoin Kelly because he wasn't going well in training, the whole thing would probably fall asunder when we played on the Sunday because he wasn't playing.

"That's good management as well."

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