Previous year Strength of Schedule is the worst predictive metric anyways. You always have teams come out of nowhere or just shit the bed yearly in the NFL. This year it could be that Tennessee is going to go 15-2 and new england goes 6-11 and what will the previous year's SoS matter ?
To a certain degree yes. But some divisions are consistently strong and some are consistently weak; for instance last year Miami played a consistently weak division in the NFC South. This year they will play the NFC North and the AFC West which both have strong teams.
Miami will have one of the worst records, if not the worst record, in the NFL in 2026; They'll be lucky to get 4 wins given all their personnel changes.