LSU and Arkansas biggest winners out of this?

I think so.

Hows that? How were Nebraska and Colorado making it harder to recruit Texas??

LSU has had success recruiting in Texas largely by pitching the opportunity to play in the SEC and still play close to home. Had Aggie joined the SEC, Aggie would have had a better pitch in this regard than LSU. So this result avoided that negative impact on LSU.

Now, the pitch only has legs if the SEC is the top conference. The Big XII without Nebraska and Colorado is weaker. So the SEC is even stronger. So this result positively impacts LSU's recruiting opportunity.

Win-win.