I can see the logic in this. If you know you're going to be flying *A, and are aiming for *G in a hard-to-qualify program (e.g. LH), but want to enjoy *G benefits while you're doing the BIS miles to qualify, then it makes sense to grab an "easy" *G first. You then use the *G card for benefits like lounge access, while you accrue miles to LH (or whatever).