I am NOT a fan of rock music by in large, but I have always thoroughly enjoyed INXS's music/style. As such, I would want INXS to stick to their style/music without trying to find a Michael Hutchence clone (sound or style). For me personally, I will usually pay attention to rock groups only if I like their music. It's very rarely the 'frontman' who gets me interested in a group (Green Day is about the only exception I can think of) - rather it's the music itself. As a fan of INXS who isn't a fan of rock music in general, I'm probably far less 'experienced' when it comes to who would 'work' the best for INXS. I know a good singer when I hear one (hey, I am a singer myself) and I know a good musician when I hear one (hey I am a musician myself), but I don't necessarily know a good rocker when I see/hear/smell one. I just know what I liked about INXS and who I think could reproduce that (and who would send me in the opposite direction).
Personally, I can't stand JD and probably wouldn't be very interested in INXS if they ended up choosing JD. He just seems so contrived/choreographed and his voice is utterly irritating. If I got to choose the new frontman/woman of INXS it'd either be Marty or Suzie because I think they are the most flexible and versatile and they are appealing on a number of levels (to me anyway). In the beginning my faves were Jordis, Ty, and Brandon. Jordis starting sucking and her performances leave much to be desired (she lacks emotion), Ty was too theatrical though he had arguably the best voice of the whole bunch, and I dunno what happened to Brandon (maybe it was the shoes?). I really starting digging Suzie and Marty as the weeks went on and like what the two of them could bring to the group.
I don't think it's as important that the frontman/woman have the exact same style as INXS/Michael Hutchence...so long as INXS itself doesn't start morphing into something new, I think the new member should be someone with a distinctive sound, is a good performer (without seeming as if he/she is 'performing', IYKWIM), and has a versatile voice more than that he/she is the most similar to INXS's style. I think Marty and Suzie are the only two left who fit that bill. JD would definitely be my last choice (one of my last choices of the whole 15, actually). Oh well, at least Britney, errrr...Jessica is gone