The real reason this version of the AR doesn't work in the SEC are the following
1. the size and physicality of the SEC DL
2. The speed of the DL and LBs create pressure on the OL and forces the QB to make hurried throws to the short routes. The speed of the LBs take away those passes from being big gainers.
3. Wide splits allows DL to utilize spin moves as well as stunts and shifts without having to blitz from LB or safety's. When DL can get pressure on QB it's a free for all in the routes for corners and safety's
4. Secondary can play zone give up short routes and make tackles on underneath routes. Lack of a running threat allows all secondary to play off ball, no play action or threat of a run means no bite from corners or safety's.
Closing: it ain't about WRs as OP stated it's the fact there's to much speed on on the SEC defense that the ML Air Raid won't work.