I know that everyone can delay cancel to s.C but it won't always hit properly (I've missed because close s.C came out from too far away) this bypasses that giving a guaranteed hit upon activation confirm. If you miss the timing, no activation no spent meter or HD.
But yeah, I did some more tests this morning and similar start ups can be used on other characters but their mileages seem less viable (except for Kim, sorta). Vice can shoulder ram for no meter but if it comes out too slow you can block the HD meaning tighter timing. Both Kyo's have the run attacks but you gotta cancel that almost immediately to get a reasonable HD, and their s.C's can whiff like Ryo's can. My only issue with Kim is close s.C needs to be canceled right away, far s.C still hits and gives you time to cancel it, QCB +BCD is just another plausible tool to that already vicious threat.
Back to the point. Delay canceling overheads with HD into s.C gives varied results with certain characters, I've had Ryo HD drops due to whiffs off of mid range overheads. This always hits in follow up and due to the move being so fast and forward moving it can be done at any range for the same success. Plus it gives you a little bit of time to compose yourself for the HD you just started.
Hope this wall of text doesn't come off as angry or argumentative, just stating the tool and reasons to use it over other options. I personally still jump the gun and activate too early sometimes, but when I remember to activate HD late, this gives me success each time rather than an occasional whiff.
TL:DR
Delay canceling HD into s.C can whiff at odd distances. Special bypass canceling off overheads is a generally unexplored option. I hope I don't sound angry.