What do you think? Just one barefaced One10T cab is more than enough to handle a rock n roll drummer and 2 guitars distortion of partners in reharsals or need a pair of them to be listened?
One10T definitely not enough unless everyone plays with restraint and consideration for your volume.
Pair of One10 could be enough depending on the venue and what amps the guitarists are using. If you are outdoors and the guitarists have 412 cabinets then you will need more. If you are rehearsing at moderate volumes in a room with 112 combo amps, you should be okay.

