He could take either of these old-timers alone without too much trouble. Anakin is a powerhouse whereas these two are old, burnt-out fossils. Kenobi isn't going to make any headway with his Soresu assuming he has it fresh enough in his head to where Anakin won't just find an opening and end it. I'm a believer that Old Maul is inferior to TCW Maul in dueling ability; taking into account the Inquisitor performance, failure against Kanan and stalemate with Tano, he shouldn't pose much of a threat to Anakin.