I was thinking what if... The Enterprise was the only ship to be the furthest ship out exploring the edges of federation boundaries. Also I assumed that starfleet gathered most of there Connies together when the Klingons started the war with them. Also we saw how a fleet of Connies could be formidable in combat. I've been thinking that the Connies that were lost were replaced the franz tech manual showed that starfleet had a array of ships from destroyers to scouts and tugs also the dreadnought was been built at the time possible to replace the Connie ??