Yea, I mean, you really don't get much about football, do you
?
IF (and this is very massive IF) Solanke would return and be in peak form. Then he would be used as target-man. So someone who is mainly expected to take down the long balls and retain possession upfront.
Neither Richie nor Kolo Muani are not good AT THAT even though they might be (and I'd even say Richie quite clearly is) more clinical scorer.
So when all 3 are available, we either start with Solanke + either of the other 2 or potentially with front 3 with all of them (more unlikely but interesting as thought experiment).
It is not a magic bullet that sorts out everything at once, obviously not! But it would still be useful .