Minor league rehab assignments can be fooling. Rarely do you see 'little league' numbers from a major league pitcher or hitter when they go on a rehab assignment, even to low A. In many cases the guy has mediocre numbers yet, when they get back to the majors, they pick up where they left off before their injury. Sometimes it can be the highlight of a minor leaguer's season (or career), witness John Drennen homering off of Roger Clemens in a rehab assignment a number of years back.
So, are Lonnie Chisenhall and Michael Brantley ready to contribute? If you have watched them play in their rehab assignments as I have, I think Brantley looks more ready than Chisenhall. Some will tell you that Chisenhall IS a AAA all-star/ML bust guy. He hasn't looked like that so far. His swing looks slow. Brantley, on the other hand, looks fluid when he is out there but he isn't out there all the time.
I don't really think either is ready to help the Tribe yet but we will likely soon see both of them. Clearly we can afford to DFA Colin Cowgill and send out a reliever.
Time will tell. Let's hope both come up and start putting up huge numbers. The Indians can sure use the offense.