10 months post op Invisalign. Is he right or giving my a runaround to avoid revisions?

The last three trays are normally over correction trays and they really only close any remaining spaces. I have never heard of the last trays having the most force.  It sounds like you are going to need a refinement so if you were my patient I would not wait the extra weeks.  Discuss it with your dentist and see if you can find a solution that works best for you

The easiest way to answer your question is to tell you how we would handle your situation in our office (based strictly on a hypothetical with the details you provided). We would evaluate the Clin-Check software which shows us how each tooth movement was planned and when movements were staged. The evaluation of the tooth you feel did not move could be specifically examined. Some questions I would have would include: What movement was prescribed? What was the assessment of that movement (easy, moderate, advanced)? What attachment type was used? Did all previous aligners fit as designed? When/where did the tooth movement stop? Was slenderizing (IPR) indicated around that tooth? Typically, if we determine there was planned movement and it did not occur as planned we would proceed directly to a "Refinement" and take new scans or impressions. Over-correction aligner sets are included with each case and are designed to squeeze the teeth together and eliminate any spaces. Bodily movement and rotation will take longer than 3 aligner sets and are not typically part of any over-correction movements. I would encourage you to return to your dentist and discuss your concerns. Together, you both can determine the best course of action. We wish you all the best!