he's the longest reigning IC champion since The HonkyTonk Man.
Correction: He's the longest reigning champion since The Rock held the championship in 1997 for 265 days, and Shelton's reign lasted for 244 days.
Now to make this a non spam post, I'm gonna have to agree with some of the people here making the point that he could very well go under the "success" section, but in the end, he didn't reach the main event scene, and ultimately ended up doing nothing but serving as talent enhancement to guys like Zack Ryder, Vance Archer and Sheamus, which weren't anything memorable at all.
The last time we saw Shelton doing anything remotely memorable is over a year's time ago when he held the United States championship before loosing it to MVP.
Now culminating that period of time, where he weren't doing anything, with a decently successful career for the remainder of the time, but ultimately failing hard in being pushed into the main event scene, I remain believing that he should be voted an In-between, but I'm not gonna bash people's votes, just pointing my point out.