In my opinion "Switchblade" Jay White has to be considered a top contender for the IWGP Heavyweight championship. Over the last twelve months I don't think anyone has really shown through as someone that NJPW will be looking as a stable person to build around other than White. Last year they helped build his credibility during the G1 Climax with wins over current champion Tanahashi & former champion Okada. However, I do think that White still needs a little bit of time before he finds his footing as a main event talent, but I do think he has what it takes.
Overall I'm not sure if he will be the top contender for the gold as NJPW might want to hold off on giving this match away so early in Tanahashi's reign, but I do believe at some point we will see the legend face the up and comer. In my opinion the WWE needs to take a lesson from New Japan in how to build a new main event level talent as Jay White's push has been fantastic & his 2018 is proof of that. I think his potential is shining at this point and it will make for a very interesting 2019 not just for the "Switchblade" but for Bullet Club as a whole.