You should leave the hip, buttocks and thighs in the rig. The hip is the "root" of the bone hierarchy, if you remove it, Poser will try to make a new "root", messing up the positions in the process.
Another reason to leave the hip and all the rest in: scaling. Apollo uses scaling for smaller/larger characters, you'll want your boots to scale nicely along with Apollo, and for that you'll need all the intermediate bones between the hip and the boots too.

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