maybe they are targeting cocomelon upload schedule. perhaps there's a window of opportunity to be placed in suggested before youtube analyzes the video and resorts the suggestion section. maybe the window is 2 hours?
on my browser, the most recent cocomelon song (2 hours old)
youtube.com/watch?v=KEZp5_DgABA
has a NikiChiki video as the NEXT video in suggestion.
youtube.com/watch?v=3cu6dsBSVm8
and if i refresh a few times it suggests this other nikichiki video
youtube.com/watch?v=y13fgw1t4aU
Also maybe livestream videos have different rules for suggested and its easier to get in there?
dave and ava channel is livestreaming right now
youtube.com/watch?v=Ukm5UCstgkU
and on that video suggested i see nikichiki and bona nursery rhymes suggested.
pretty amazing the nikichiki channel is verified account and it only has 2 months of videos. My channel is couple years old with over 1,000 videos and im not verified yet.