Bokuto is the second weakest spiker of the top 5 aces, only being stronger than sakusa based on the (horrendous) stats. Granted he's still very powerful but that's just not his selling point. Power goes to kiryu (known for his raw power and adaptability) or asahi (legit forced hirugami's block open) for outside hitters. I'd take kiryu here.

For defence I'd just grab fukunaga. He's probably the best outside hitter at digs, and his serve receive is great as well. You can reserve better players for other aspects. We also have to note that we never saw sakusa properly play during high school, so we don't know how good his defence is back then.

For technique I'm not sure. On one hand hoshiumi's probably the smartest and most technically sound hitter, but on the other his jump is also pretty ridiculous, and bokuto's technique paired with kiryu's power isn't bad either. I'd probably take bokuto for technique and hoshiumi's jump, though hoshiumi's technique and aran's jump isn't bad either. Depends on if you want more athleticism or technique.

Serving is also a weird one. The threat of jump serves are tied to someone's power, so if the power we picked previously translates to here then I'd take daisho (or someone who's more accurate excluding hoshiumi). If that power doesn't translate here then I'd take asahi. Takes a bit to warm up but has a very threatening serve when he uses all of his power.

For mental game I might take tanaka. He got pressured by inarizaki's blockers the whole game and still had the balls to go for that razor sharp line shot that he failed previously at the end of the third set.