I really think Remy and Deadpool would join X-Force after solos.
Here is part of old interview with Jeff Wadlow X-Force writer
http://screenrant.com/x-force-movie-interview-jeff-wadlow-characters-story-deadpool/To get a better sense of the game plan, we
asked Wadlow about the roster selection
process:
Are you being given free reign to pick the
characters you want – or does the studio
have their own ideas of who they want?
What’s the balance there?
Basically when they hired Mark [Millar] to
oversee their Marvel properties, he started
talking about some characters they were
thinking about doing solo films with – that
could maybe then lead to a team movie -
sort of following the Marvel/’Avengers’
model. And I said, ‘Wait, wait, wait, that’s
not what’s cool about X-Men! Marvel’s doing
individuals who become a team; this should
be about, like, other teams, and I want to
make an ‘X-Force’ movie, and this is how I
would do it.’ And I pitched him the idea, he
got real excited and gave me some great
notes that I incorporated, we took it into the
studio, I pitched them, they loved it and they
said ‘Let’s do it.’