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Also the M10 was a derivative of the M3, so it did not really hamper M4 production.
I know it is only one source (and YMMV) but Zaloga in NVG57 page 6 states that the original T35 was based on an M4A2, and (page that the Army was so desperate for tank destroyers that they had a higher priority than M4 tanks. There was concern that M4A2 chassis production would not be adequate so the M4A3 chassis was used to build the M10A1.It might be that the M10 assembly line might have replaced M3 production (but that is speculation on my part).
Do you know I have Steve's visit card? There is also a group picture in front of the main building at the RMAS with us standing together!
I know it is only one source
but because Zaloga NVG matched Hunnicutt (and the official sources too) it makes more than a single one