what i'm in agreement with (nothing new here!)-
low end will be because the O didn't progress. that key position players don't match last year's keys in all groups. also includes K/Ps and SPTs. that coaching stayed relatively the same.
high end will be because the O progressed some, became more balanced, broadened their book. that there's no drop off on D. that the kicking game and SPTs progressed some. that coaching decisions and game mgmt improved.
confidence: D will be very good overall, maybe no drop-off at all; K/P & SPT will show some improvement. the run game will be solid again.
lack confidence in: OL pass protection, QB, playbook. getting the TE's more involved other than just run blocking. that coaching- game prep and in-game mgmt will improve (hip-hip-hooray if the QBs seem more comfortable and we have less need for K/Ps and SpTs)