The only caveat is the indoor and environmentally controlled court, which MEP is unaccustomed to, vs an outdoor, environmentally uncontrolled court, which MEP is accustomed to and is more suited to his defensive style.Am assuming that Ian is classifying Sean as the equivalent of a USTA 4.5 since the video is titled "4.5 NTRP play". That makes sense as Sean is clearly competitive with MEP who has an official USTA rating... The indoor league Sean plays looks to be much stronger than USTA so his 4.0 rating there is irrelevant.
I think if the match took place in Atlanta in July outdoors, Sean would not be nearly as close. For one, Sean hit some very nice winners/forcing shots that MEP would likely track down on a slower court outdoors.