I think that Xmen cameo should be forgotten. If Part 3 is an MCU, then Part 1-2 must also be viewed, so it is also an MCU. Sony-Venom-Spiderman crossover = Venom 2. is similar.
In addition, he was Shield Helicarrier and Raft in the Deadpool movies.
That was NOT a S.H.I.E.L.D. Helicarrier. Completely different to the Marvel Cinematic Universe design.
The Raft did not appear in Deadpool 2, that was the Ice Box.
Deadpool is in the X-Men Universe.
Reasons:
- Ryan Reynolds Deadpool
- X-Mansion
- House getting blown up "adds character"
- "McAvoy or Stewart"
- Logan movie poster
- Hugh Jackman Wolverine's death statue
- Xavier's wheel chair
- X-Men cameo
- Hugh Jackman Wolverine on a serial box
- Essex House for Mutant Rehabilitation (ties into X-Men: Apocalypse, Logan and The New Mutants)
- Weapon XI death (which is Deadpool travelling to the Original Timeline and creating a new universe canonically)
Additionally, the Marvel Appendix confirms that Deadpool 2 is set it's own universe. It's likely that Earth-17315 (The New Mutants, Logan) is either in the timeline where Wade dies or in the Venessa lives/Peter lives timeline/s. So, the Original Timeline, Cable's Timeline, Logan's Timeline, Deadpool 2's Timeline, other Timelines then... the Marvel Cinematic Universe timeline?
Wouldn't it be more logical to assume Deadpool would be connected through Cable's time travel device, hence the multiverse? Pahaps in the MCU, Vanessa is alive but Wade passed away from cancer, which pressures him to stay in Earth-199999? Therefore, it's a sequel without the first two actually happening.
Deadpool 2 is also set in 2018, as confirmed by Marvel themselves.