There are two problems with this concept.
1. We have needs at RB2 and TE3 that probably need to come from the draft. Sure, 4th and 5th round picks in my book but the draft cannot be "all defense" IMO.
2. Gil Brandt from NFL.com just released his "Top 150" prospects list and he has Lamp as the #41 overall prospect.
Walter Football has Lamp at #51 overall.
Matt Miller at Bleacher Reports has him at #47 overall.
DraftTek has Lamp at #30 overall.
CBSportsline has Lamp at #29 overall.
Sporting News does have him ranked #21 overall which is not much of a reach.
My point being is that while Lamp appears "safe" and is at a position of potential need (I disagree; whoever wins of Haeg, Good or Schwenke will be good), he appears to be not terribly good value at 1-15.
For fun, I decided to go back and look at the 2016 "Big Boards" to see where Ryan Kelly ranked.
Gil Brandt has him ranked at #25.
Walter Football had him ranked at #27.
Matt Miller had him ranked #20.
CBSportsline had him ranked #25.
Sports Illustrated did have him ranked #51. What do they know?
Anyway, my point is that Kelly was much more a "consensus" first round talent than Lamp is. Who knows how the Colts have Lamp ranked but just blindly deciding to take him in the first round at 1-15 seems a bit of a stretch.
Cheers,