Both Heath and JF refused to change their systems despite the awful runs and club position. BH got sacked and JF kept us up, then the following season Rodney came in and scored the goals that kept us in this league (whether Rodney was bought in by JF or by Mr B remains unanswered).
PW altered his system when we signed Rodney and we have prospered since then and that's the difference. Without the Rodney signing PW could of carried on persevering with TSS in which case we would be well off the play offs by now and PWs job would be on the line. Learning and adapting is the key here.