Without seeing the routes Dispatch files ... for arguments sake I'll assume they DON'T file J15 between ABQ & CME -- but use CME as the initial fix on departure / last fix on arrival. In this case, ABQ J15 CME wouldn't be a 'route segment' & I guess radar vectors on departure / arrival would be planned for. In either case, you'd be on this 'route segment' - if flown - well below the valid altitude for using DD / TC anyway (i.e. in initial climb or in descent). Perhaps TOC or TOD points even have something to do with it. In any case - great question ....
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