I would like for you to bear in mind that what you are about to see is a defensive highlight—it shows Josh Donaldson, Toronto’s third baseman, making a nice diving stab to his left, then rising to make a throw across the diamond. It’s the throw you’ll want to watch, in particular—it jumps out at you, despite the pay no attention to the man behind the curtain glove-work. Oh man, that throw: That was one of two highlight-ish stops Donaldson had in that game, Thursday: the second time also involved a dive to the dirt and a throw to first— that throw, unlike this one, did not bounce 20 feet from its destination, but it did have the happy parabolic arc and moseying pace of a pitch in beer league softball. Josh Donaldson’s throwing arm is in rough shape. The good news is, whatev…