min3bet and cc with JTo IP

[Wi11i]

folds around

I raise :jh :ts OTB to 8$
SB 3bets to 16$
BB calls


one's a donk (the CC) and the other is a showdown muppet... you can obv. see that because he cold called a shove after the first guy overbet the pot on flop for almost 50%

it's 8$ for me, call or fold?
Marginal play? What about if villains were unkown?