There is plenty of talent available to PM, yeah some of it is young, so coach them up. That is his job title after all. What we need is a coach who plays to the strengths of the players he has instead of plugging in guys who are terrible versions of the player he wants. Defending better instead of less is questionable in todays NHL even when you have D-men who defend well, and we don't. PM has an abundance of puck moving talent available to him, so he needs to focus no using that to transition quickly so his team spends less time defending instead of putting in replacement level journeymen and hoping they will defend better.
I agree he needs to coach -
And your points makes sense - but IDK if they can get there before it's too late.
The talent is there but they are not defensively talented - that will be the challenge.
Transitioning will help - but there still needs to be an over all defensive mind set that is lacking.
It all starts in your own end - if you can't get possession and you don't necessarily have the skill set to drive that transition game, you'll struggle with this until you learn and action that type of game.
The vets are there for one reason only IMO - Mo can't get everyone up to speed as quickly as needed so he is falling back on vets to hold down the fort until we can execute. The problem, as you've pointed out, is the skill level with the vet pool - it's not there.
I honestly don't think the answer will be as easy as pointing out what needs to be done (ie; transition, puck movement) - it's going to involve a learning curve in a situation where there is no time for a learning curve. This situation with our D core is not a typical challenge - we lost most of our core and now we're trying to not only replace them, but change the game plan / strategy in a hurry.