Sounds interesting. I wonder if Morgan is able to keep up for burst in speed builds like that though. Think if you have a team that can pull off 22+ attacks in 2 turns, Shingen would probably be the better choice for FBs, no?
I'm a bit sad that I'll never get to try the machine gun burst tactics that wind has myself, mainly because I don't have a wind team... lacking almost all of the himes needed to make that happen. Unless jewel gacha RNG changes things drastically on that count for me, I will only be able to speculate on such builds. :<
The closest thing I have for experiencing a fast burst build is in my water with Ashy+Atalanta+Aphro (the triple-A combo, as I call it), but Herc seems more than capable of keeping up with that combo, so I'm not sure if Shingen will really even benefit my current lineup. I will still likely get Shingen's relics anyway, simply because I have enough spare regalias to do so and eventually get all of the souls' ones even. But sadly, I don't think I'll ever get to experience the chain-gun burst builds currently (due to just not having enough himes).