Eh, Brunson and Mitchell are about a wash talent-wise. You could give the edge to either, but they're about level. KAT is at least 2 levels better than Garland. If Garland were as good as Tyrese Haliburton and they had the same flame out, you'd be crazy to say you need to trade one.
And again, name me the team that you can trade KAT to for quality depth pieces. I'm not even being a dikk about this, you and I both probably lead the Knicks Coli fanbase in hypotethical trade proposals. Who COULD and WOULD trade for KAT, and what would that return look like?