Tomb raider (2013) had an opening week of ~430K on X360 and went on to sell 1.88 million. On PS4 it had an opening week of ~165K and went on to sell just over 1 million.
RoTR is looking like having an opening week of 220-250K so it's LTD is looking like something around 1.5 million. X360 looks like it will be about 1/3 of Xb one. So over all the game is looking to sell about 2 million on Xbox. 2.2-2.3 million including digital.
Considering SE regarded 4 million in sales of TR(2013) to be disappointing I don;t think they will be too pleased with RoTR sales on Xbox. But I don't think they will be too upset with reaching 2 million, eventually. However unless MS paid them $60-70 million+ for this exclusivity SE will be very glad that it's only a timed exclusive.
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