Join Date: Jun 2010
Location: Dublin, Ireland
Bikes: Specialized Sirrus, Giant OCR3, Giant CRS3
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Riders aren't ejected for doping they leave 'voluntarily'. The B sample results are never in by the end of the race so technically they still haven't tested positive.
The answer to your question is yes team mates of a rider whose A sample tests postive could end up winning the TdF. If the B sample was also positive they would still be the winner as far as I know.