Title Says It All. I Personally Think He Would have Been Pretty Powerful, Since He Was The Leader Of Akatsuki Then How Could HE Not Be At Least Jonin Level? Please No Flaming (For Whatever Reason You Would Flame Me For)
i say he was probably one of he weakest imo but the leader anl needed to organize a strong group and lead i mean if he was that strong he would still be around right
Probably not that strong. His death was the catalyst for Nagato's coming out party. I seriously doubt he would have matched Itachi or Nagato had things been different.
He would be around Kakashi's level if not higher he was taught by Jiraiya yes but that doesn't entirely mean that he is that strong i doubt he would be any stronger than Deidara if he progressed further
He seemed to realize that Nagato had a higher potential of becoming stronger so it seemed like he was just the glue that kept the group together rather than the actual strongest person there, which he seemed to put in high regard to Nagato, that's why he praised him so much.