“It's impossible to say whether the missing part of elevator was lost in flight due to the lightning strike or during ground impacts, but I would guess the latter is more likely”.
I’d disagree; for a relatively lightweight elevator to detach due to fuselage impact is highly unlikely. In any event, we’ll soon know with certainty. If the missing part was lost in flight then it won’t be anywhere near the impact point. If it was lost during ground impact, then it will.