A nice thing about Shingen is that you can use whatever on EX. That means you can also build burst team without Hastur since she's only there for her debuff (at least setup-wise) which can be substituted with Ambush. You can put Gaia on the last slot like that & still manage the same speed while having a reliable option for defense instead of a bit more offense + sacrificing free EX. On a side note, Shingen setups require Hraes support, so it's nice to have Herc around if you don't have too many Hraes friends.