KC traded their first and then a first to move up to pick Mahomes - who then sat for a year while the Chiefs won the division. They then traded Smith despite a great season and seeing almost nothing from Mahome in live snaps. If they had followed your path they wouldn’t have a title and future HoF QB.If it's always a risk outside of the generational guys, why not keep the 15 pick to take a premium player at another position(say one of Parsons/Slater/Darrisaw/Horn or one of the top WRs are there) and take a shot on a Kyle Trask or a Kellen Mond in the 2nd round? If I'm not coming out of the draft with Lawrence and I'm picking where the Pats are I think it would be better to get more bites at the apple in terms of building the roster instead of putting all my apples in the Fields/Lance basket.
Edit: the implied thinking here is that the Pats hopefully won’t sniff the top 15 again for a long while - so this may be their only shot for a long time at taking a swing on an elite QB prospect