Drew Peterson has done well. I don't see what O Brissett does that would be an upgrade over Drew.
No need for a Brissett return IMO.
He's a better defender, penetrator, and rebounding and he's better at being in the right spot. He gave us 11 mpg last year, and played in about 2/3 of our games, which is better than any other non-rotation wing we have.
And of course we could have both. Both add more than Springer.
Of the two, Brissett and Walker, I think Brissett would be more useful. The Lonnie Walker fascinations I don't see. We could sign Brissett if we wanted and he wanted I guess. Not sure what is going on. And I do agree that Brissett would be some level of upgrade over Peterson. That isn't saying much though, to say a player is better than a 2-way player. The same could be said of Springer, he is better than Davison.
As to what players could be available for $4M (Springer salary) and a pick, I don't know, but I don't think it is worth trading a pick to just get back another fringe player. If that is all you can get, just keep Springer and keep the pick. Springer is still only 22, at least he has some ceiling.