Because Garber (after overseeing the demise of NFL Europe) is willing to have MLS do anything for money. Doesn't care if English speakers can enjoy the Friday game (still no FIOS SAP and the streaming English commentary was off by at least five seconds once again) and will gladly let UniMas do anything it wantst to the broadcast as long as they tell him he's important.
I get all that but if they weren't showing that entire Mexican game anyway then why do the split screen at all.