We allready talked about this so many times ...
I never stop to wonder me why people think Astarion specificly should have any skills at all, i mean ... yes, he had a few (2 of them if i remember corectly) centuries to gain experience, but from his own words, all he did for Cazador was to find a fine looking noble and mingle with them long enough so they are inter ested in some private action ... and then simply lure them to his Master's lair.
Wich of that says "Rogue skills" to you? xD
(And btw i say this the whole time ... he should have ben Bard.)
Wyll's story was partialy rewritten, wich made him a bit messy ...
But this was exactly my point during EA, when i thought that Wyll is a unwilling fraud ... imagine the twist, if he would find out during our adventure that Myzora was leading him by the nose this whole time ... and all those "heroic wictories" he brag so much about, were just her in disguise, or some low imps or something.

Shame ...
Gale in my honest opinion makes the most sense ... thinking that he wields an orb that "consume magic" ... it seems only logical that his own magical powers will be diminished by that. He may still know all the incantations, but simply lack spellslots.

And finaly Lae'zel ... this is imho just another case of ego boost, no matter what Lae'zel does she automaticly assumes she is better at that than anyone else, just bcs she is a Githyanki and they "simply are better". xD