This is really a bizarre way to argue that the youngest of the players named is too old to re-sign.
Why would we sign a player who doesn't fit into our long term plans just because we signed players to long term deals 4-5 years ago? Especially when two of them only have 2 years left on their deal after a hypothetical Buch extension and one of those players is actively being shopped because we want to get younger around the 23-26 age to fit in with the new core.
If you are going into a rebuild you aren't going to just sign players because they are younger than your oldest players. And you can't compare signing a player to a long term contract at 30 while going into a rebuild (that could end up being a long term thing) to signing a player at 26-28 while you are trying to win a cup, they are completely different stages in the life cycle of a franchise.
Then add on to that, Who even says Buch would want to resign with us if we do end up going towards a rebuild. He's right at the end of his prime years, why in the world would he stick around to be on a losing team for the finale of his career when he could go off and play on a team with aspirations to win a cup within the next 5 years.