The only question with Ranger is 32 starts, but he probably has the lowest stress per pitch of any starter, he doesn't try to throw hard. Sanchez could learn a lot watching Ranger, he actually has better stuff but not the command and composure - he's still in young pitcher mode where he wants to blow his FB by hitters instead of using it strategically.
Wheeler is developing that splitter, threw a killer, if he can master it, he can take another step up b/c it's basically a changeup with great depth that will make his 4 seamer even more effective if he can throw the splitter 10-15% without hanging it.