There's been stuff before with two of them, but it was always questionable if it was just his brother helping him out for laughs on live action stuff or if there was more than one animator/writer for the cartoons.
Anyway I've been checked out on Tamers for a month or two now because I don't have any desire to watch the Dandy's World stuff but even if this means the return of SU by the mare episode Tamers (who has the actual Tamers sense of humor) it still means that kayfabe is pretty much 100% broken at this point outside of actual phonebook details and it feels pretty awful.