I pray for Sentinels downfall but I can also be objective when it comes to these things. Shahzam is the IGL of the team and if you didn't know, Sinatraa was the Sova player on Sentinels before TenZ was brought in. Shahzam has played Jett and is mechanically very skilled at it, some would say Shahzam is a better Jett than TenZ because his gamesense and aim combined is just better than mostly raw aim of Tenz. Streaming a few days before matches isin't a big deal. F0rsaken streamed during Iceland in the night and played matches the next day.
TLDR: Shahzam is forced to change his role and be a team player yet he is trying his best. Shahzam streams but puts more effort than the rest while the others stream and still put less effort in scrims.