I do feel that having them include any fox related material may be too premature. I mean, they started planning this as early as 2018, so they would bound to have already created the outline for Marvel Phase 4. Fox being bought by Disney was only finalized early 2019. So including any fox related material would be like throwing a wrench on their entire planning process, which would further delay phase 4. I do believe timing is everything. The problem with that is that the actors are not getting any younger.
In the end, this happened: