Number of All-Star games played in is generally lower on the "star checklist" for an involved fan than it is for a casual fan. Involved fans care about what the player looked like when you tuned in for a random November game via legal/illegal streaming, what his win shares per 48 has been so far this season, what his true shooting percentage in the 4th quarter has been so far, etc. Casual fans care about whether or not the guy made the All-Star team last year or not.
edit: And to answer your deeper, implied question, RJax and IT are stars, capable of being somewhere between the 2nd or 3rd banana on a title winner. I tend to believe Jackson has greater 2nd banana potential, because he's younger and this is his first starting opportunity, whereas IT is older and has started consistently before. Regardless, both are stars and impact players.