I know this is bait, but it's very common knowledge that the duration of the stream is proportional to the number of VOD views. So a 10k viewers stream of 1 hour has maybe around half views than 10k viewers stream of 2 hours. So it's natural that a 90 minutes stream has less views than a 7 hours stream.
If you look at holostats you will see that the collab had higher live viewers than all 3 other streams.
