Originally Posted by cnybirder
I think in this case you are right but Western Wood-Pewees can have almost as dark vest with the white belly. I think since the bill appears to quite thick, the head is pretty dark, and head shape looks good as well it probably is Olive-sided.
I agree with Olive-sided Flycatcher, as well as your comment. Also, Pete Dunne says that the olive-sided's vest is distinctive in that it always looks "unbuttoned at the top". That is what we see here.