Ok there are a few permutations from that 19 and with the announcements regarding 6 it could mean anyone could play.
I think Richards will miss out, but I would not predict who else.
If Percival plays centre, then Turner could play opposite centre with Lance at 6 and yes Wellens on the bench with Jones and Wheeler missing out.
If Wheeler plays 6 Lance could be on the bench Wellens to miss out.
Percival may not play and Jones and Turner are the centres, with either Wheeler or Lance at 6 etc etc
The centres and 6 will determine whether Wellens starts or not. But I think Lance has to play 6 for Brown to be able to squeeze Wellens in.
For me I would go
Lomax
Swift
Turner
Percival
Makinson
Wheeler
Walsh
Amor
Roby
Laffranchi
Sia
Manu
Wilkin
Walmsley
Jones
Lance
LMS
It's not my perfect line up, but with Wilkin in the team, you have to play LMS as a front rower. If you drop Wilkin then Richards could pack down . But you have to have 2 props on the bench in this day and age. Can see Lance playing as an interchange hooker.