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Why would it not be called 6900?

Dura-Ace skipped 8000 because 8000 belongs to MTB. There is no 6900, so I see no reason why they wouldn't call it that.
XTR - Dura-Ace's dirty cousin uses the 9000 series.

Shimano is in a common predicament (SRAM is there too) - completely future-proof naming systems are tough. Using numbers can be limiting. Look at BMW. Once it was 3, 5 and 7 and sometimes 8. Now, it's 1,2,3,4,5,6,7,8. They have no more room if (not sure how) they wanted to squeeze something in between the 2 and 3.

Contrast that with word-based system, e.g. Ford Mustang, or Scott Addict. There's no limit to where the brand can go - up or down market, renew every 2 years or 10 years. Companies can add more and more brands/names and nothing is "out of order".

Shimano's is sort of a hybrid - using both, e.g. Dura-Ace + 9000. They've used the "M" designation on the dirt for a while, e.g. M9000 (XTR).

They'll figure something out - could be D9100 and U7000... or some other system we'll mindlessly adapt to, learn and use like a second language
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