If they get a collab as part of the 4+1 thing, people will rightly be annoyed. It isn't just Lisa, who deserves to get a proper amount of time in the spotlight as they did, it is poor Jisoo. Why would her solo come after a sub unit collab?
Lisoo deserve their solo time in the spotlight without having to share it with other things.
Jisoo has her drama as main lead; i think her solo will probably be next year because she don't have any time this year. Lisa is getting a solo. Jennie and Rose collab with Western artist (if it happens) will probably be just an English single to promote in west; no physical album unlike Rose's solo or Lisa's solo. How will they share limelight with other things? if the Western collab happens in August; album could be by September/ October and Lisa's solo in december.