This one's an easy
![Veto :veto:](http://www.profsl.com/smf/Smileys/default/veto-icon.png)
for me.
The Machado one is borderline as well but I'll wait on that one.
Chaps isn't playing this year, is he? So his contract is over. Or your re-sign him based on last year's performance which doesn't make a whole lot of sense seeing as he'll be pretty well 2 years older than last year's performance stats. For that reason I'd say Hand>Chapman.
Witt Jr. is what, a top-10 baseball prospect? That plus VVM and Olivares isn't even close to comparing with Gray for me. Especially given P-contracts versus an already "vet" contract.
For me I see COL trading away 2 of it's top value players on the roster (Hays and now Witt Jr.) in exchange for a couple "big" name veterans past their best years both fantasy wise and real life wise, and a middle of the pack SP in Gray (for our league with fewer teams than normal leagues on here I'd say he's just middle of the pack, nothing fancy for a 28-year old).