I think you guys are overthinking this topic. In my opinion, from what i read in the manga, there is a plothole: we don't know how madara can use the summoning jutsu on kurama. BUT, the only valid explination from the manga would be that he has indeed a contract with kurama. How he made it, we dont know. Here we cand only fanfic a response, maybe he forced kurama to accept the contract in the genjutsu.
Also, while madara has this summoning ability that is permanent and in the end the bond between kurama and madara was never broken, madara simply died, while this happened, obite does not have this ability but for a single night, precisely when kurama escapes from kushina's seal. Again, we can only fanfic why he could summon kurama in the village. It is not explained in the manga. We know for sure that obito did not sign a contract that night, so we know for sure that just puting a beast in genjutsu does not make it yours, and that if the genjutsu is broken the beast is free.
So OT, no, sasuke does not have any tailed beast under his command in this moment, he could go after them, bind them in genjutsu again and make them sign a contract. Or he could befriend them.

)
But sasuke does not have their power right now, they are not in his arsenal..