Just a rumour, however there is talk Red Bull may front up the money to get Marquez on a KTM in 2019?

Alex maybe.

Anyone can start a rumour, and did you hear about my 13 inch penis
He will stay with Honda for sure and I can see his brother going the Mark VDS route into the big boy class in 2019.

MM93 is a Honda boy, but a heap of Red Bull €€€ might tempt him to do a Valentino and move from something he can win on for fun and try a bike that's as yet not topped the podium...

Rumor or not it would be a great idea. KTM and Red Bull have deep pockets and quite frankly if you want to win the best rider will help your odds. How much money does a guy need to collect before he-she is willing to give up a huge bragging right. I believe every rider in the paddock would want to clean up on an unproven machine for the egomaniacal pleasure alone. PS Philip Island was a cracking race, the best I can remember.
KTM has said they will not replace there riders, they believe they have the right stuff. If Marc wanted to ride for them I bet they would find a bike available.

KTM riders are only contracted to the end of next season. As is Marquez I believe. A lot will depend on how the KTM is looking next year. Redbull can easily afford to bring Marquez on board. It will come down to whether he wants that challenge yet.