On one hand, it made very little sense. The literal face of WCW, the guy who stood alone to battle the NWO for like 2 years, Mr. anti-NWO, etc. joins the lesser of the two 'evil' NWO's? Even as someone who wasn't some long time WCW fan back then and just started watching WCW during the Nitro years, it was even a tough pill for me to swallow. It was weird. It was odd to see a life-long WCW guy throwing up the Kliq hand signal every other minute. Even though that is just a detail, it was still weird to see actually happen and something that never got normal to me.
On the other hand, maybe they went pretty much as far as you can go with the silent crow Sting character. He was silent for a long time, fought on his own while still being on team WCW for a long time and nothing ever really got settled from that aspect. The NWO still existed and now they were 2 groups. Maybe a change was in order for the Sting character. It did breathe some new life into his character. It was fresh. It was considered cool. Some can argue it was nice to see Sting more relaxed, laidback, and talkative on WCW compared to the previous two years. The Wolfpac, with Sting in it, was also very, very popular and over with the fans back then. Not just with WCW fans, but even WWF fans liked the Wolfpac in '98. The Wolfpac came off as more cool, more laidback, more fresh, and a younger version of NWO Black & White. Kind of like WCW's version of DX; in the aspect that they were more cool and hip than NWO Black & White, as well as alittle bit more edgy than NWO Black & White, as well.
Would I have had Sting join the Wolfpac? Probably not. But I can see what they were trying to do in that time period. Of course, in typical WCW fashion, it didn't last that long and eventually just detoriarted right in front of the viewer's very eyes.