Out of the players that have left , only Chamberlain can be considered an "asset" and he wasn't that influential. Alexis Sanchez would of course be a bigger deal but both are more a case of selling 2 players whose contracts are up and don't actually want to see out their final year and want to make the move happen now.
The bigger question is why we supposedly don't have money to spend now, which is what one of few reliable journalists, David Ornstein, has said. Theory is that Kroenke wants to build a new stadium for the LA Rams which could cost up to $2.5 billion and that's where Arsenal money is set to be invested... Obviously that might just be a case of people putting 2 and 2 together and getting 5