sorry, I thought it was a very young team similar to Nebraska when they played. Young guys, but maybe not Brohm's recruits?
WR - jared Sparks soph
OL - Grant Hermanns soph
WRs - Moore frosh & Anthrop soph
DE - Reviere R-frosh
DT - Watts soph
LBs - Jones & Barnes soph
From the below list (including all that you mentioned, plus I added all the 2017 commits that I've seen on the field), you can see what the recruits really look like.
The only high-value recruits were Moore (2018) and maybe Zico (2017). There are a lot of 2017 guys playing, but they're generally low 3* or high 2*. And a number of the ones you identified are listed as sophomore, but they're RS-soph and were 2016 recruits that were 100% Hazell.
- WR - Sparks / 2016 recruit, so Hazell, 2* at 0.7649 - also a converted QB
- OL - Hermanns / 2016 recruit, so Hazell, low 3* at 0.8065
- WR - Moore / 2018 recruit, undoubtedly 100% Brohm, 4* and 0.9123 composite
- WR - Anthrop / 2016 recruit, so Hazell, low 3* at 0.8043 (also legacy, two older Anthrop brothers played FB and BB for Purdue, and he's a local Lafayette kid
- WR - Zico / 2017 recruit, mid 3* and 0.8414
- WR - Wright / 2017 recruit, low 3* at 0.8000
- DE - Reviere / 2017 recruit, low 3* at 0.8107
- DE - Higgins / 2017 recruit, low 3* at 0.8038
- DT - Watts / 2016 recruit, so Hazell, low 3* at 0.8077
- LB - Jones / 2017 recruit, high 2* at 0.7932
- LB - Barnes / 2017 recruit, 2* at 0.7797
- CB - Major / 2017 recruit, 2* at 0.7682
Then you look at the actual class rankings and average ratings. You see that the 2017 class was not good. Yes, some of them were probably more swayed by Brohm than holdovers from Hazell, but it's not like he brought in some stellar class in 2017. The 2018 class was a significant jump, but as stated the only guy who really sees the field is Moore.
2016: B1G Rank of 14th, national 80, avg 0.8113 rating
2017: B1G Rank of 14th, national 72, avg 0.8188 rating
2018: B1G Rank of 11th, national 51, avg 0.8469 rating
2019: B1G Rank of 5th, national 25th, avg 0.8605 rating
So I agree it's a young team, but not comparable to Nebraska's young teams. Nebraska was 4th in the B1G in 2018, with an 0.8719 average rating [higher than even Purdue's 2019 class], and the Riley class of 2017 was 5th in the B1G, with an average rating of 0.8781. 2015 and 2016 were both above 0.8600 average.
So Nebraska should be fielding a more talented team, top to bottom, than Purdue, despite the fact that Frost has emphasized the younger players.