Here's a screenshot of Solanke's positioning over the season - note this is by Fantasy Game Week (so there are two in GW29, where we played Fulham and Brighton). Data is from Fantasy Football Scout. Green are home games. In GW28-30 Solanke has averaged nearer the opposition's goal (all being outside of the centre circle). GW 27 was Liverpool at home, so you'd probably expect our players to be deeper.
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But, we could just have been playing easier teams too in GW28-30. I've eyeballed the average position in the games to see how Solanke compares with the next highest forward. It would take too long to try and put into graphics, so you'll need to trust me (or look back through the average position graphs).
With some exceptions (Fulham A, Chelsea A, Man U A) Solanke was typically not much farther advanced (if at all) than others. This was particularly when Moore was playing as we'd expect, but even when not (against W Ham A, Tavernier and Billing were higher, and Solanke was pretty much level with Fredericks, Christie, Cook and Lerma).
In the last run of games, Solanke isn't that much more advanced: Ouattara was as high at Villa and Traore was higher against Brighton. At Leicester, both Christie and Ouattara / Tavernier weren't much deeper.
This is a long-winded way of saying I don't know. It could equally be that the team is gelling more and thus having more attacks (and hence all players are further up the pitch) than Solanke being told to stay on the last man.
Hopefully this is useful and people can interpret the data better than me!