Sumail carry? I think he will take the midlaner position as in the previous team, I think OG is trying to resuffle all their roster, trying the best game from each player, it is not impossible that the sumail position as a carry will be replaced if it is not effective for him in the long run.
I think Sumail is good as a carry, currently OG is mixing things up between their mid and safe lane because they had some success with it previously like the mid gyro and it could be a good strategy to trick the enemy team. Unfortunately Sumail won't stay for long in OG he's only acting like a temporary replacement for ana since OG announced he'll be taking a one year break from playing competitive iirc.
yes I also think so that they are trying to match the right position for all players, hmm I guess I always have a reason not to participate in any competition or tournament other than TI,
unfortunately also this year TI was postponed because of this pandemic.