Any TH undertaking is always massive. This is a useful datapoint whether he tracks TH4 vs. TH3 or not.

Theory in practice at the moment is this:
1) TH1 matters, gives a re-roll
2) TH2 matters, gives a second re-roll
3) TH+1 and the TH proc system, as far as any of us can ascertain, do all of jack shit.

So it doesn't really matter if he tracks the proc system, as long as number 3 is true. If we'd like a second way to measure this, I've started working out the loot pool for procced NQ Dynamis monsters:
Slot 1: Currency 100%
Slot 2: Currency ???%
Slot 3: Currency ???%
Slot 4: AF2/D1 Weapon
Slot 5: Crafting item
Slot 6: Currency ???%

I'm betting Slots 4-6 aren't affected at all by !! Proc, and Slots 1-3 are added.