BP is something you absolutely should have in your arsenal, but it sounds like you might do just fine even without. Maybe. Looking at upcoming content, we have:
Raid Guild Union Raid Advent Union Raid Tower Advent Advent
Since you can probably do just fine in multiplayer content without BP (just leave killing the boss for others in worst case scenario), it does seem like you'll have plenty of time to pick up Mordred after Herc. Probably.
Since you have Michael though, Shingen would do you really good. Sadly, you can't really rush Shingen out, but just pointing that out.