Shigure: raven +4 each stat buffer?

I have a +atk -spd Shigure, and have been trying to find a use for him, since I already have an Inigo who uses Bowbreaker but no Axezura. Thanks to the TT, Hone Spd has come out, allowing him to give +4 to every stat. I have Ephraim, who could buff +11 with Reposistion, since I prefer to have him be able to protect a blade tome user. This is 5 less than Shigure could buff. I wouldn't be able to use Wings of Mercy on Shigure, but he would still work. Shigure can survive Brave Lyn with Brave Bow +atk +10 Quickened Moonbow, unless Cancel Affinity is on her. Should I invest into Shigure, or stick with Ephraim? I could always have other units buff alongside these two, freeing up Shigure's B slot, but that would be harder to pull off. I use Nino as a blade tome user, but i'm never too sure on who the other two teammates could be, maybe Joshua when I get him and someone else. Any advice is appreciated :)