Just for some modern talk on here regarding NFL caliber players and receiving yards (Iowa's offense is NFL style in regards to TE utilization)
4 TE were in the top 25 for receiving yards in the NFL in 2018, No RBs made the top 25.
So saying that our number 4/5 options will return and are comparable to your number 4 WR that is a potential NFL player, according to cyclonenation, is not dumb, or stupid, it is just the facts. Now you do have your other top 2 and 3 returning, but they were not up to Butler's level in terms of production at that spot.
So, Oliver Martin will be someone that can push for making that unit better, I get it ISU did not want him, because they had not shot at him in terms of him being from Iowa City anyway.
IMO, ISU returns more production at the WR spot, but I am not seeing that huge talent gap that there was even 2-3 years ago at WR. I think Iowa is still behind ISU, but ISU lost their 2 all time best WRs the last 2 years to graduation.
Heck, I think Iowa's TE will struggle a little this year due to the guys we lost, I am not in fantasy land thinking since we are a TE factory that we will still be an upper echelon unit there a year after we lost that talent.