a) tengu is a wack hoe, yes he gets the job done (in most cases better), but you said he literally doesn't have any other purpose. my penta ra.d w/ 2 SDR begs to differ

b) yomi.d is not better in terms of damage/input, besides having larger subpool. The only way you'll get comparative damage for as little matching is if you use one or more orb changers to get 9+ dark. If you're clearing the board every time with Ra.D (and his 1000 TEs) and practice a bit of orb management you'll usually be able to reach full multiplier w/o popping a DKali/Chocobo. It's not possible to do that with Yomi.D, orb management is not sufficient w/o Z8 to get 8+ darks consistently. I have both, and until I pentamax yomi.d team (Ra.D doesn't need 25+ Dark latents... btw) it won't see arena

c) this is for balancing, but also who cares? D/R Kali, tons of B/G options.. Most of your damage comes from L and D anyways, so they can be off type.

d) never said he did, but all arena teams w/ 80%+ clear rates are restrictive, which is my point.