Every team knows where every other team has a weakness or need in their opinion.
No one "tipped their hand". If it's obvious to us, it's clear as a bell to the other 31 teams. But each team has their own needs to address, as well, and that's more important than trying to block the Rams from a player.
But who here or anywhere knows how big of a priority the Rams will put on Center? Who here or anywhere knows if the Rams draft a Center, which one it might be? Who here knows if the Rams believe that they have their Center on the roster, maybe it is a starting Guard, and so what they'll be drafting is more for a replacement Guard than a new Center?
The Rams are very good at hiding their moves and are tight lipped.
As I said in another post, when they took Akers and Jefferson, I'm unaware of anyone thinking these guys were even on their radar.