Lemme explain to you all of the points.
Grumpjaw is broken in the jungle because of the Tension Bow+Aftershock+Stormcrown build that is absolutely ridiculous right now, Cheap, effective, still very high damage especially with the proc.
Baptiste is really good because he is very powerful in the early game and requires little gold to be effective. His Ganking skills are really annoying right now. His main selling point is all the CC in his kit and CC is pretty much more effective in 5v5 than in 3v3, especially CC that can hit more than 1 person(like Baptiste). He is also very good in draft as he can flex into all roles except mid lane, which Broken Myth explained at the bottom.
Lorelai is difficult to put work in at soloq. That is her main problem. She is somewhat like churnwalker, who is B tier in soloq but the best captain in pro play. She also performs much better as a top laner in 5v5 with her high single target damage with little crystal items, which means that if she isn’t fed she can still put out good work. Lorelai would be a captiain in the high Bs or even A if iit was NOT talking about soloq. Their list is for soloq only, they even explained to me on twitter when I asked why CP Kestrel is not S-Tier in the mid lane when she is literally one of the most broken mid laners when you know how to player her.
The Problem with Skye is that Skye even as CP does not do AOE damage while the jungle and mid lane would prefer a hero that could do AOE damage as CP like Baptiste and Celeste repectively.
WP Skye is difficult to pull off because of the intense CC in 5v5 from the likes of Grace, Lyra, Ardan who shut her down before she can get breaking point stacks. It is difficult to pull off skye in soloq in general.
If it wasn’t a soloq tier list Broken myth’s placements would be much more accurate.
Edit: I forgot to mention how good WP Baptiste is now. In the Jungle and Top Lane. Tanky, extremely high sustain and damage and still providing all of the CC you want escpecially in 5v5.