To be honest I think the only 'safe' ones are Havertz and Mount. The former is a generational talent and the latter is our poster boy.
Werner, Ziyech, CHO, and Pulisic haven't shown enough that they are good enough to help lead this club to a title challenge. Obviously we have to wait until the end of the season for a final assessment, but I reckon maybe one at most will show their worth come the end.
Still question marks over Lukaku on whether he is willing to accept a minor role as its become evident we operate better without a focal point.