I was watching All Good Things and in the alternate future timeline Admiral Riker told Picard he ordered the USS Yorktown, which was never seen onscreen, to scan the Romulan neutral zone and my thought is that the USS Yorktown could be Sovereign Class and is the very same ship as the Enterprise-E in the normal timeline, just with a different name, registry and crew and never had Picard, Riker, Data, etc as officers since the Enterprise-D wasn’t destroyed. I assume that the Sovereign class was well in the planning stages and even in the early construction stages at the time of Generations and what become the 1701-E was originally intended to have a different name and was renamed Enterprise-E after the Enterprise-D was destroyed at Veridian II. I’d like to think that the Sovereign class Enterprise-E existed in the AGT future timeline, just with a different name and registry and that senior officers from the Ent-D didn’t serve onboard. Not to mention it’s conjectured that the Constitution refit 1701-A was originally named USS Yorktown. Of course Memory Alpha says that starfleet had an NCC-20045 USS Yorktown in service during the 24th century which I guess would be Excelsior class.