I have been reading that of the true freshman wide outs Rashard Higgins and the former Washington commit, Sammie Long, have been the most impressive so far in practice and will likely see time this year. The redshirt freshman, Jordan Vaden, had a really good spring and camp will likely get the start on the outside for the RMS. McElwain is bringing in a different type of receiver than CU fans are used to seeing on the CSU sidelines. Most of the young guys are 6'2 or above. As far as Udofia goes, I haven't heard much about him. He just arrived on campus in August and I can't imagine he will know the system well enough to have that much of an impact in the RMS.
Not sure where you are getting the information about the LBs. They actually look like they will be the strength of the defense this year. Shaq Barrett is an excellent tackler and can rush the passer. Cory James was a freshman All-American at seasons end and a likely all-conference player this year. Aaron Davis and Max Morgan are Juniors and will start on the inside of the base 3-4.
I have read the LB's are the strength of the D, the safties are good, the questions are the CB's and the D-line (due to depth, and experience). At the same time it seems the DL has done well against the OL, and the OL is supposed to be a strength (which means the OL is good & the DL is great, or the OL is average and DL is Good, or OL sucks and DL is better) On offense the talk is the depth at RB and TE, along with the afore mentioned OL. The big questions on O are who is the QB, and who ends up playing at WR.
In the end it is all still a crap shoot as no one knows how the units will work together. The Buffs have seen the OL/RB/TE before along with the LB/S combo. We will see how it works out.