So in 1998 Sin/Dex run for the while year?
Murder 101 started in prog 1051 ('97), and that run got interrupted with prog 1077 (the all-Dredd
In The Year 2120), then again with prog 1100 (all-Slaine
Lord of the Beasts) and prog 1101 (a jump-on), 1111 (a jump-off), then ends with Eurocrash in prog 1139 ('99).
That gives you an 89 prog span (with only 4 blips).
The span includes double episodes (15), triple episodes (1) and the full prog 1138 takeover.
At the time, it felt like the prog was a three-hander with Dredd and Sinister Dexter being the tent poles and Dante being the tent. All the other thrills were just a variety of circus acts.