I checked out your video, and as the owner of (currently) nine Marshalls, I can say that you're way off the mark.
Marshall tone doesn't come out of a stompbox. Oh, the right pedal may help get you to a defined sound.
The real thing here is something that's big, and obvious, and players just keep missing it.
IT'S THE CABINET AND SPEAKERS.
The classic Marshall sounds are mostly from 4x12 Marshall cabinets loaded with a relatively small range of speakers, those being variants of the G12M20 and G12M25 Greenbacks, G12H30s, etc, for 60s tones and G12T75s as well. (Kiss tone) Those are the speakers, and the 4x12 cabinet they're in, that probably does more to define the Marshall tone than anything else.
I associate Mesas with EVs in 1x12s more often than any other speaker/cabinet choice.
If I plug a Marshall into an EV 1x12, and plug my Mesa into my Marshall 1960A full of Greenbacks and Creambacks, then the Marshall sounds like a Mesa and the Mesa sounds like a Marshall.
At the very least I recommend a 2x12 with Vintage 30s as the minimum for a "Marshall sound".
My ears tell me that speaker and cabinet choice is the biggest tonal determinator of all. Swapping cabinets makes more of a tonal difference
than any other single difference out of anything. (When swapping like for like.)