You can't completly say YES or NO. Here's why:
PROs:
- He controlled the Kyuubi. Itachi said you can only do it after you unlock the MS.
- He can use S/T techs, which always come out from his right eye. No other 3TS user can do it.
CONs:
- We've never seen the design of his hypothetical MS. If had one, he's definatly only the right eye, which is always showed as 3TS.
- No drawback whatsoever by spamming his S/T techs, which we supposed were MS techs.
- Itachi believed Tobi was Madara, the same person, so I dunno how much truth we can take from him. The fact he said that you can control the Kyuubi only if you have the MS, it could be just an assumption, considering Madara was the only one capable of doing it and he was famous for being the first with his brother to unlock the MS.