Henry has been having some issues that've limited what he's been able to do since just after the TLC ppv. Initially, at least based on what I've read, it seemed that Henry's injuries were going to be severe, to the point in which he might not even make it to WM. So, choices had to be made and the direction to go was chosen.
In that time, it seems that Henry's issues aren't what they were once feared to have been, but the direction the WWE made under the assumption that he was severely injured have worked out. They put the WHC on Daniel Bryan and Bryan is one of the most over heels on SD! right now. His mic work has improved a lot, he seems to be much more comfortable in his current character, his feuds have been interesting and his matches have been great for the most part. Just because Henry isn't hurt as badly as it was initially feared doesn't mean that WWE was going to or should just drop a storyline with a wrestler that's obviously working.
A depush isn't necessarily a burial. As I aluded to earlier, choices were made to go forward with different angles & feuds after Henry was injured. Sheamus & Big Show are two very over babyfaces right now and both of them have big title matches coming up at the biggest wrestling show of the year. Henry is a guy that's been dominating SD! really since last summer, so faces gaining wins over someone like that gives faces momentum heading into their big title matches and make the viewer think that the face has a very good chance of winning his title at the big dance.
In wrestling matches, you've got to have winners & losers sometimes. Someone is going to be elevated in the match at the expense of another. There's no way around that and it has to happen, especially when these matches feature wrestlers that are going to have big matches at a big, upcoming show. Losing a couple of matches here and there doesn't mean someone is being buried.
Also, the bit about comparing Orton & Henry reminds me of something. Even if Henry were being buried, it's not realistic to compare him with Orton. Randy Orton is someone that's been delivering for WWE time and time again virtually the entire time he's been on the roster. The first 14.5 years of Henry's career in WWE were about as far in the opposite direction from Orton's career as possible. I know we'd all like to live in a world where there are no special favorites and nobody gets special treatment, but that's not how it is. If Orton gets special treatment in some situations, it's because he's earned it. He's been a bigger star and made lots more money for WWE than Mark Henry. That's not just wrestling, that's life.