Spong said a few days ago he's open to mma, but his current focus is on boxing, him being 4-0 and aims for 10-0 to get bigger fights. But I'd approve. Sign as many exciting top strikers as possible. Worked in Pride, would work now. UFC wouldn't have to toss them to grapplers, just have some fun striking matches. Some of them will develop good defensive grappling and find mma striking range eventually, like Hunt & Cro Cop did. And when they do they become HUUGE.