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I can't imagine any scenario for RNG where the relic bow wins.
I've thought about Yoichi myself. Namas arrow has a 40% str and 40% agi mod, with a static 2.75 TP bonus. Coronach is 40% dex and 40% agi with a static 3.0 Tp bonus. R15 yoichi and chrono arrow combined damage is 420, while R15 anniha + chrono bullet is 455. The only true shot gear we would want in our weaponskill set is tellen belt, so at most we'd have 12% true shot. All in all, annihalator's coronach and yoichi's namas are roughly equivalent if yoichi is shooting from true shot range, but coronach should still have a small edge. Yoichi is perfectly viable here. It never makes darkness on arebati, and its enmity gain is only a bit higher than anniha's. It isn't high enough to ever pull hate if you stick exclusively to namas arrow.
That said, if you already have annihalator there's no good reason to build yoichi. Arrebati can be killed exclusively with annihalator. I cleared him on Veng 25 three weeks ago for the first time, and we did exactly what celeb said. I alternated between coronach and slug shot, while our corsair was firing off last stands and detonators. Slug shot is the better weaponskill at 1K TP so we wanted me to be doing the slug shots and the cor to use the detonators. We got unlucky and had to shoot through attack down aura at 40%, but we had an extremely strong showing in the first KI and chunked him down to 49% so we had a good head start. We got a wild card reset and between the two bolsters and basically 100% uptime on double and triple shot we still managed to push through to the finish line with about 4 seconds left on the clock. I did switch to gandiva just under the 1 minute mark though with around 3% HP remaining. I needed its power for that little extra push, and in that situation gandiva was far better than pinaka would have been (Pinaka's damage tanks hard with low pDIF ratio, whereas gandiva's crit damage and empyrean bonus excels). Yoichi would not have won the fight for us though.
TL;DR version, if you wanna shoot arrebati dead and you don't have annihalator yet then yoichi is probably a good choice for a first REMA for that fight specifically. But if you already own anniha then yoichi is just redundant. If we hadn't been stuck with attack down aura we'd have had a couple minutes to spare. Annihalator is perfectly servicable for that fight. It's more about execution than anything else.