Meh, receiving a big push and succeeding with a big push are two very different things.
Look at Big Zeke's last 'big push', when he won the IC gold...didn't last long at all. The problem with Zeke is no matter how big he is, and how intense he tries to be, his move set and overall in ring performance is crap. Same can be said for Mason Ryan.
It's no secret Vince and HHH are fans of the huge, sterotypical 80's build wrestlers, but fans these days just don't buy in to size alone. In the era of Punk, Bryan, Ziggler, Rhodes....etc, it takes a lot more for a big guy to get over in WWE.
If you look at the big men in WWE that have gotten over in WWE, it's guys that have been in the business and in the WWE for a very long time. Undertaker, Kane, Big Show, Mark Henry...guys that spent years improving their talents and characters, and winning over the fans. It took Henry practically his entire career to get to the point he is at now, and Kane's relevance is typically the product of character re-invention.
The other problem lies in the fact that since both are so green in the ring, and are so damn big, the roster doesn't have a depth of talent to really put them over. With Zeke on Smackdown, the only other people that match his size are Henry and Show, and both are too far up the ladder right now to have any sort of program with him. Leaving him to feud with smaller mid card talent, many of which, with the exception of Rhodes and a few others, aren't going to carry him very well. As for Ryan, I don't really see where he fits in to the picture at all, especially if he stays on the Raw side of things. If I were creative, I'd put him in an enforcer role, maybe add him in to the Ziggler/Swagger/Vickie stable, just to get him some exposure and heat, before trying to re shove him down the audience throat again.