Quite frankly, your logic is skewed. Yes, Light pitched poorly, but it was an extremely small sample size. Ramirez, while still relatively small in sample size (but still 5x more innings than Light in the majors), has pitched poorly and is simply a AAAA pitcher. Light has better stuff.
And yes, it would be the Pat Light that, despite the walks at Pawtucket you reference, still owns a lower WHIP than Ramirez at the AAA level this year and a lower ERA to boot.
FYI, if you are going to use stats to make an argument, try using all of them, not just the few that attempt to prove your point. I would tend to argue that Ramirez has had more of a chance to show that he is NOT MLB quality than Light has.