OK, so far so good. Turns out damage resistance reduces end of turn damage as well (probably should have known that), so thanks to WBv2's innate damage reduction, tanking against Beckman is much easier. With the stat boost from the Shanks fight, I should be good for quite a while.
The rest of my teams are working fine (though I adjusted my Roux team to be led by TM WB, which made it much simpler). Big Mom absolutely wrecks the Mihawk stage with the right subs, though I'm sure it was built that way. Brook can also block Ace's orb unfavorability (use it the prior turn, same strat as Colo Ray, just wasn't sure if two turns was sufficient), so he works well for that fight.
Yeah, this Beckman fight was pretty clearly intended to be a double legend Garp showcase when it debuted in Japan. With Garp however, the only available ATK down reducer is TMRR Ace. Can't use Ganfor since he's a striker. I have to imagine with Garp being a 1.5x HP booster stalling was still a viable option. Japan at least had Corazon boosted, who I'm pretty certain is owned by more people than Ganfor or Ace so team building was a bit more forgivable. I'll be using a V2 WB team simply because it gives me 6.64x multiplier. If all else fails I can default back to a Garp team but I'd only get half as many points.
I actually didn't even think of getting two silence reducers with double Garp, probably because I never really considered using Garp as a captain. :P But yeah, we were worried that they'd forget to boost Garp for Global's TM, but even though they did we didn't get the proper supporting cast.
And yeah, if I get to higher levels in the 30+ range and my current team won't cut it, I'll just find an unboosted unit or two to use. Having two WBv2s and Log Ace is a solid base for the multiplier, it can survive unboosted units at that point.
I actually wonder for these rare TM characters how many copies actually exist in the playerbase. Like, a couple thousand maybe??
Well, I've been doing two multis per TM sugo since TM Kizaru and I've gotten the rarer booster two times (Beckman and Bell Luffy). I think they usually sit around a 1-2% chance. Add that to the fact that few of them actually work well as captains past early levels, and yeah, they aren't going to show up much on your friends list.
As a side note, Booster Beckman has been vital for me in 3-4 TMs so far (including this one), absolutely got my gems worth there. Too bad Bandai's starting to phase the older ones out. I totally get it (the list is unwieldy enough already), but I kind of wish the ones with specials tied to TM would always be boosted, since they're way less useful elsewhere.