You just can't accept my facts! Keep your illusion.
Why pre production J-10b not using WS-10A with higher thrust when latest J-11b, J-11bs and J-16 are running freely with WS-10A? WS-10A has demonstrated its maturity by running on prototypes of J-16 and J-15S initial flight test. None of Shenyang latest fighter jet suffer from shortage of WS-10A engine.. While J-10A or J-10b needs to bite the bullet and continue use Russia engine?
Using Russian engine is the only way to break the blockage of Liming limiting Chengdu fighter presence in PLAAF.
Why WS-15 transfer from Liming to Xi'an?
Shenyang and Chengdu are rivals which is undeniable. Their products are very similar for the needs of PLAAF. Chengdu beat Shenyang in the contest for 5th gen fighter for PLAAF. This hurts SAC and its a fact. Chengdu knows it and lobby to CCP higher level for the transfer of WS-15 to Xi'an to prevent similar fate of the high priority J-20 to be delay.
This just doesn't make sense. I can accept some competition/rivalry between the two companies/institutes. However, I cannot imagine one would have the capability to attempt to hinder the other one. While they may be separate entities, they both belong to the Chinese govn't. All it needs is an order from the govn't to allow the engines to be shipped to Chengdu. If the leadership in Shenyang dares to defy the order from the top, they would be fired immediately since they would be potentially hindering the development/modernization of the PLAAF and PLA and China as a whole.
Some competition on a lower level is possible, but withholding THE most important parts to the project with THE highest priority of PLA modernization? highly unlikely.
Keep in mind that they all belong to the govn't and answer to the CMC. They can have competition as long as the govn't allows it, like submitting multiple designs for the same projects. However, they will have no choice but to collaborate if the govn't tells them to collaborate.
My guess is that, since WS-10 is not as mature as AL-31, they want to minimize as many variables as possible while testing all the new techs on J-20.