this is probably the best new powerset idea ive seen. hands down BUT
giving all the clones sudden mob would mean at some point the screen would be full of clones which from a comic perspective would be damn awesome but giving the clones the ability to make so many clones at no cost to the caster is kinda unbalanced, thugs gang war has a 600 second cool down which means it cant be up all the time but "sudden mob" could theoretically be up constantly so i propose some light changes
Uncanny Image: Tier 3 power instead of sudden mob death to uncanny image triggers power faulty facsimile.
faulty facsimile: When killed two clones of lower tier spawn.
simulacrums do not get access to fault facsimile power instead their T3 is Replicant Rupture
Replicant Rupture: When this power is triggered target explodes in a flash of light, the explosion deals no damage but blinds all foes in melee range for X seconds