When overfeeding on carbs, then you are correct in that it probably would be better to overfill the muscle cells rather than have the glucose transported into adipose tissue. In other words ALA would be beneficial for the endomorph in periods of overfeeding, i.e. refeeds, etc.
On the other hand if you cause the cells to be think they are in a fed state, then lipolysis will be halted. You can basically "trick" the cells into thinking they are in a fed state, when in actuality they are not, and this will disrupt homeostasis in the cell. If an endo is going to supplement with ALA then you would want to make sure that the nutrients are available to avoid sending a "false" fed signal.
I hope that makes sense