B98.5 is still an AC station, whereas Star 94 has been a Hot AC station for well over a decade, even if it took the slowpokes at Mediabase several years to move that station to the proper format.
The two obvious reasons why B98.5 is still an AC station are the fact that they've played 'Stronger' 39 times in the past week, which is somewhat high for an AC station, as opposed to tons of Hot ACs which are playing it a lot more--anywhere from 60-75+ spins per week.
It's also on track to be the #1 Hot AC single of the year, and has certainly become the biggest top 40 single of Kelly's career.
The second reason is the lack of really hard rock on B98.5; Hot ACs such as my hometown Hot AC (KBIG/Los Angeles) play tons of rock from the likes of Joan Jett, Bon Jovi, Foreigner, AC/DC, Springsteen & Def Leppard just to name a few, and there are undoubtedly tons of Hot ACs out there which do likewise, and I listen to a ton of them.
Hot AC & AC do share tons of listeners in market after market, and especially the ultra-important adults 25-54 and women 25-54 demos. and have since the AC format exploded nationally in 1982 thanks to Jhani Kaye here at KOST.
Furthermore, Hot AC started to take off in the late eighties & early nineties as top 40 radio fell apart, and 100+ stations bailed out of the format, including top 40 powerhouses such as WNCI & WZPL, in order to hold on to their adult listeners, and especially women & their kids.
The rise of Hot AC, AC, Country, Classic Rock & Smooth Jazz stations starting in 1987-88 all came at the expense of top 40 radio, for which the nineties were an unmitigated disaster.
By1992, not only was Hot AC the hottest format out there thanks to newly-launched stations such as KYSR, KFMB & KHMX and many other burgeoning powerhouses-to-be, but Country became the most listened-to format in the country, and it's been there ever since save for a brief drop to second place behind News-Talk in 2008/09.
If Atlanta does get a Classic Hits station, there's no doubt in my mind that it will do extremely well and pull solid 25-54 numbers, since it appears to me you've got everything else radio-wise which can make money and draw satisfactory numbers of listeners, even if that means a 'rimshot' or two to cover the market.