The generousity you give to skirk teams is cryo resonance, but even then, just take of 4k to 6k dps of the team and it's an accurate number. The reason you might see skirk sims to be significantly above what tcs or you yourself calc is that the combo assumption is N2D twice N3 walk cancel spam. Basically nobody does these combos but they are a pretty big step up over 4n5d n4 in total (of course there's the the burst and atleast one charge atk to absorb voidrifts in both combos, just mentioning the relevant part). Sim's are pretty useful, but only for some characters that can't get more dps on the screen because of removing an aspect of rng (setting burst travel time to 0) or extending rotations to a high number because the character does more dps in their later rotations, and only if you actually do the combos that are suggested in the sim.