D'Arnaud was almost ready to come back for Arizona Fall League, there's no reason to believe he won't be 100% healthy come February 12th when pitchers and catchers report.
"A little speed". Gose will steal 80 bases if he can get on base at a decent player, he can be a Michael Bourn-type of player with 10 homer power and plenty of doubles.
You're trading a guy with one year left on his deal who doesn't have a UCL; what the Jays are rumoured to be giving up is for sure fair.