You all watch, this third signing will be a 20 year old goalkeeper that is "one for the future". Kidding.
On a serious note, I have no idea why Rodriguez is signing unless he truly shows great potential for the future. Naismith is a guy who can play up top and give us hustle and workrate but not a ton of end product. Add to that, Kone has shown glimpses of being decent. Today he made several poor mistakes, but also did some positive things and he's clearly working hard to try to win over the fans and prove himself.
If we're going to sign a striker, it might as well be someone of half decent quality who offers us something different from what we already have.