Merge Blocks Doubles Up GCP's

Hello, I have 26 separate blocks AT'd along a 10.5 mile narrow corridor with 90 GCP's, I need to process them separately to avoid the curve effect, however everytime I go to merge small blocks consisting of 3 to 4 GCP's every GCP along the corridor just doubles up and I have multiple of the same GCP's. How do I keep these GCP's from constantly doubling up? Also, do GCP's act as Tie POints in this situation?

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