I think what really answers this question is health and injuries. If Cutch, Wong, and Yelich stay (relatively) healthy, then Counsell will probably go with reasonably strict L/R platoons wherever possible for almost everyone except Wong, Yelich, and Adames. Not saying Cutch won't bat against RH pitchers, and Rowdy won't hit against lefties, but I'd guess barring long DL stays, Rowdy would see 400 - 450 PA's, and Cutch, about the same.
Like you said, the wild card is Hiura. If he comes even close to 2019 Hiura, he's gonna play nearly every day, SOMEWHERE. If he's OPS-ing .850 and hitting righties, Counsell will find a way to get him in the lineup. DH, 1B, LF, maybe even (gasp) spell Wong a day or so here and there. I don't honestly see that, but if it happens, it's a nice problem to have.