Well, sure, but that’s kind of where the +/- gets pretty vague. I mean, if you’re going to factor in movement speed to overall Rend application rate, you should probably also take into account the fact that Wrenching Smash is stunning everything within 24 yards, which is 2.56x the area of CC you get from Trapped’s secondary. So you’re getting some damage back there.
My point is just that these sorts of nuances are really tough to calculate in a comprehensive way.
Also, for the sake of thoroughness, here’s “Seasonal F+R” vs “Non-Seasonal Core”
Season F+R-
100 * 1.5 (Focus) * 1.5 (Restraint) * 1.14 (Doombringer) = 256.5
Non-Season Core-
100 * 1.3 (IB) * 1.25 (Mantle) = 162.5
(And giving Mantle that full 25% is definitely overly generous, since it doesn’t play well with Area Damage. A more realistic figure would probably be something like 12%)
So, 256.5 / 162.5 = 1.578, aka Seasonal does 57.8% more damage, about 3 GRs. (3-4 if you only assume a 12% boost for Mantle).