I agree, not to worry about K. In fact, on TK K is slightly higher up the "food chain" than J - not that it makes any difference in terms of mileage accrual.

HOWEVER, please note that any TK flights only earn 25% STATUS miles on M&M. So you will earn 150% award miles, but only 37.5% status miles (150*0.25). This is LH punishing those flying TK. Obviously, you can avoid the LH style punishment by crediting to ANY other *A program ...