Personally, I'd be very happy with Randle. I would definitely first look to see if I could get an established vet in exchange for a package which would include Randle if need be.
However, if the Celts drafted Randle, I'd be cool with that.
Also, who's to say that Randle won't end up being a better player than Sullinger. I can almost guarantee he ends up being a better player than Olynyk as I think Olynyk is at best, a primary back-up.