I would agree with you that Coleman leaves a huge hole by rushing up to make the block but you couldn't say he was more at fault than Tim (who if he goes as soon as the pop pass to Ryan is made would get to the D for sure) or Darragh or Joyce who don't even bother sprinting back.
Hayes' tackle is from a different age of hurling. There is no way you will a see a Limerick forward (or a Clare, Waterford or KK one for that matter) use that technique... his two hands are on the hurley so instead of opening his arms and soaking in the Clare player he bounces him off and then starts walking again. Hayes needs to bring way more aggression to his game or it just won't happen for him.
To be fair to Cork, this clip was the polar opposite of what we saw in the first half where we got the bodies back, particularly the 2 wing forwards and we were putting in the hits. They did the compare and contrast better on the Sunday game on the day of the match. So are they just flahed (they shouldn't be) or is the defensive system and technique poorly coached, or is it individual players not doing what they should? It's probably a combination of all 3.
And fair fucks to Barrett also, the only player putting in any effort in that whole passage of play.