Quick and Easy Questions (please read the OP)

[Handsome Jack]

First: unlike Phasing, Disassemble isn't draining to be in, just to switch into repeatedly. Also, just as a swarm of bats (another example in the Power) could attack effectively, a pile of sand is pretty dangerous. Look up a sand-blaster to see what I mean.

Second: anything a new character can do, an older character can do just as well. Alt Forms and Power-Ups would be as unnecessary as requiring someone with Shapeshifting to purchase additional Forms whenever they wanted to alter their look. I'd assume a Move coupled with Shapeshifting.