It's impossible to tell a priori whether any particular antidiabetic will cause weight loss because of a decrease in insulin, or a weight gain from substrate shifting or some other factor. Some people lose weight on thiazolidinediones from all the anecdotal discussion of the drug I have come across. Metformin is another drug that does not induce weight gain in many people; in others it does.
There is also no research to suggest ALA will "shuttle more nutrients into the muscles for a faster recovery" For starters it has no demonstrated effect on amino acid transport, nor would one be expected from its mode of action. Second, glycogen synthase levels limit the rate that glycogen can be stored in muscle. As glycogen accumulates, it shuts off this synthase, blocking any more glycogen deposition. Any additional glucose that enters the cell will be used as fuel rather than stored. And this glucose is burned at the expense of fat that would otherwise have been burned to maintain cell function.
Insulin is a potent stimulator of glycogen synthase. By lowering insulin with ALA (remember, ALA has never been shown to do anything in people that are not insulin resistant; about 75% of the population) you will lose out on the increase in glycogen synthase caused by the insulin and possibly reduce the amount of glycogen stored in muscle.
Antidiabetic drugs like ALA have one purpose: to lower blood sugar levels and hence insulin levels in type 2 diabetics, and restore glucose homeostasis. They are not designed to improve athletic performance in normal people; they are designed to help the symptoms and stave off the health risks of type 2 diabetes. An improvement in athletic performance in obese or diabetic people using ALA or another such drug come about becuase these people are unable to use glucose like other people.