Taking a step backwards in a new relationship is much, much harder than taking a step forward. So if the counsellor suggests *ending* the poly relationship for a time, I would tread around that carefully and let W and the counsellor talk it out.
I personally consider the biggest problem to be that W is not at all intimate with you at this time. So that's the issue I personally would try most to emphasize to the counsellor. However, you have to make your own decision what's most important during this first session.
A half-an-hour Skype session isn't long, and I tend to think it will take a number of sessions to make headway. You'll have to cover as much ground as you can per session, plus this first session will be a time to figure out whether you and this counsellor are compatible.
It seems like it would be so much easier to just put the poly relationship on hold for awhile. But sometimes the most obvious path doesn't turn out to be the best path.
Best of luck to you,
Love means never having to say, "Put down that meat cleaver!"