If Becht can still bring it (and there's no reason he shouldn't - he's appeared in all 16 games in each of 7 or more seasons) his impact, while mostly invisible, could be huge.
We haven't had a really good blocking TE for quite awhile. Coincidentally, we haven't had a really good running attack for quite awhile. As far as the running game is concerned, I wouldn't be shocked if Becht turned out to be the missing piece of the puzzle.
One other thing - before we all go out and buy bus tickets for the many vulnerable TE's on our roster, the signing of Becht could, instead, trigger the end of the lead blocking FB in our offense. We might prefer to go instead to a one-back set with either multiple receivers, 2 TE's and/or an H-Back instead of the FB. Which would be more TE's and fewer (if any) FB's on our roster.
Final point - Within the past week, we've made 6 unsexy but important moves to strengthen the "infrastructure" of our roster. This serves to do two things: (1) put us in a position to "hold serve" with essentially the same roster that got us to the Super Bowl last season. (Anything other moves we make to improve our roster can be considered gravy) and (2) instead of devoting a lot of time & energy on backfilling", we can afford to take a longer view toward building the franchise - by drafting great but raw athletes and then developing them &/or taking a chance or two on a boom or bust type with a high roof/low floor. Or messing around with a slash/wildcat type offensive player.