Those trade proposals are bizarre at best.
Swiston for Westerman ... now let's just be clear here - Westerman has low value. He's not going to sign an extension in all likelihood, he wants to try the NFL and his deal is up at the end of the season, so you're valuing him at whatever you think between 11-14 games of him is worth. Not a lot, but Swiston has zero value as a trade asset. He's on his second contract, so he's likely not as cheap as other players who can equal his production.
Suber for Tim Brown ... there's win-win and then there are just make believe trades that make no sense. This is the latter. Suber is good, but where does he fit on a BC secondary? He's not replacing Ronnie Yell, that's for sure.