User blog comment:AYET/Impel Down - Luffy and nakama vs Blackbeard Pirates/@comment-3425840-20130807085354

Well a bit troublesome, but here it goes, considering pretime skip BB nakama were way weaker, Luffy gang might pose some problem. However Teach at that point would be able to kill Luffy in record time because Luffy had no haki techniques and his gears won't work against Yami Yami no mi and physically Teach was way superior at that point I mean he even survived an attack from Whitebeard to the head and fought against Sengoku without much recovery time.

Also Once Luffy is out, Teach can deal with Crocodile easily as with his Logia powers negated Corc was far weaker than Luffy.

In the end it depends on the approach. If the BB pirates allow stalling then they would still win imo but with difficulty but if they go for the kill early I think It would be total massacre.