Q6: Wouldn’t it work better to treat Experience Points spent as dropping directly to the Base Points of the true form for the purpose of figuring the Disadadvantage requirement of alternate forms? By this method — spending points buying off true form Disadvantages cascades down to the Disadvantages of all alternate forms 1:1, and spending points improving the true form’s Characteristics/Powers/Skills/Talents/Perks means a choice between a 1:1 reduction of Disadvantages in the alternate forms or spending additional points from the true form for a 1:5 increase in Characteristics/Powers/Skills/Talents/Perks for the alternate forms.
A6: No, the method described above works better. First, your suggested method assumes the forms all lose Disadvantages at the same rate, and that’s not a safe assumption. Many alternate forms remain pretty much unchanged throughout the course of a character’s career, neither gaining abilities nor losing Disadvantages. Second, there’s no reason the true form’s earning and expenditure of Experience Points should automatically be reflected in the alternate forms, whether at a 1:1 rate or any other. The fact that the multiple forms share the same body does not mean they necessarily share the same experiences, grow and learn at the same rate, or experience the same changes. Thus, only points spent on the Multiform Power itself should have any effect.
Let me try to illustrate by example, though that’s a dangerous method.

Let’s assume, for the sake of argument, that you build the Hulk using Multiform. Banner is the true form; the Hulk is the alternate form. One game, the character spends most of his time as Banner, roleplaying and exploring a new city he’s visiting. He earns 2 Experience Points, and puts them into a CK 11- of the city itself (or some other KS). Why should that have any effect on the Hulk form? The Hulk doesn’t share Banner’s knowledge and hasn’t gained anything from his experiences. There’s no reason he should automatically gain 2 points’ worth of anything, or lose 2 points’ worth of Disadvantages.
On the other hand, let’s suppose there’s an adventure spent mostly as the Hulk, fighting bad guys and whatnot. The character’s true form — Banner — earns 2 Experience Points for this. Since he hasn’t done anything to earn them, and has had no experiences that would allow him to improve himself, he should spend those points on his Multiform, to improve the Hulk form in some way. (Or, if the GM prefers, save the points until he can spend 5 on himself and 1 on the Hulk, or whatever.) Based on the Hulk’s experiences, the expenditure of points on Multiform might be used to make him stronger, tougher, more intelligent, give him a KS of the foe he just defeated, or the like. Or, it could be used to buy down a Disadvantage; maybe the events of the adventure taught him anger management and reduced his Berserk.
In some situations, such as the suit of Vari-Armor described in one of the Multiform examples on 5E 137, the player must track the changes from character to character closely, because there’s not really a “change” taking place in the person himself. The guy in the armor learns the same stuff regardless of how he configures his suit, so he needs to be sure to augment his forms to reflect the KSs and other stuff he himself learns. But he could improve the “strength” of one armor configuration without touching the others. In the case of the strongest suit of armor, he would spend points on his Multiform, creating 1:5 “Experience Points” for the form, and which would cascade down to the others (and be ignored, if he had no reason to improve those suits). For the lesser suits, he could wait for some cascading points later on, or (more likely) it would require the GM’s permission to boost them a little, within the confines of the points in the strongest suit. (This is similar to adding Nightvision to an owl after you forgot it, as discussed above, but in a different context and requiring even more GM monitoring.)
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