ISU does NOT routinely put 4 WRs on the field. In fact, they hardly ever do. Every time there are 4 pass catchers on the field, one of them is a TE split out wide. My thought is that if Bundrage and Daniels are really as good as the staff is talking, I don't see a reason to bring in 4. They will have three pretty good upperclassmen in Lenz, Horne and Gary plus West has seen time. Then there's Bundrage and Daniels (who may end up at TE). My opinion is that the only way you bring in 4 is if Daniels is going to TE, Lampkin to T&F, Ecby is a bust and Jennert is transferring out. Otherwise use the scholarship for a defensive player and bring in more WRs next year to keep the pipeline full.
OK, even if we usually only play 3 WRs, we still need more than 5 or 6 WRs ready to play. There are no guarantees on anyone so I still think it isn't a bad idea to look to the future if there are good WRs available.
Your argument is that we should be fine this year with the following:
Lenz
Horne
C. Young
Gary
J West
Bundrage
JQ Daniels
(Note, I listed these guys by class. Young will probably be toward the bottom of this list as far as PT goes based on PT this year.)
That would be fine for this year. It gives us a similar 7 man rotation to this year. However, the staff has to think multiple years in the future. Lenz, Horne, and Young are all gone after this year. That leaves Gary and West as the upperclassmen with Bundrage and JQD as having limited experience as RS Sophmores. We then have to fille 3 spots with Ecby, Lampkin and whatever recruits are signed this year. At this point we don't know how any of the youngsters are going to pan out. Bundrage sounds like he has the best shot so far. JQ sounds good, but it's still up in the air as to where he'll end up.
We have no clue how Ecby, Lampkin, Q West, P harris, or Dondre Daley will work out. You also have to factor in injuries and other attrition. I don't completely trust Gary to completely stay out of trouble and he is likely on a very short leash.
In college football, you basically have to assume that a few guys every year are going to be busts or leave the program. It happens at all levels, even with 4 star recruits. ISU has had relatively bad luck at WR over the last 4 years so the staff has to make up for it by stocking up on talent when they can.
If there aren't any defensive players that the staff wants more than Chance Allen, then I think it's a great idea to take him. It increases the odds that we get more than one WR that can contribute out of this class. Bringing in another WR this year instead of next give that recruit the chance to redshirt, physically and mentally mature, get a good grasp of the offense, and increase the amount of competition in the WR corps.