As great as he is, keep in mind that sometime in the next 10-15 years, a guy will come along who is statistically/raw skills/ eye test better than Mahomes. This is simply inevitable and is why a current player is always going to be the greatest at the position because sports are progressive. At the time, no one thought it would be possible to ever exceed Steve Young, but then there was Rodgers and now Mahomes. The "perfect" quarterback is no longer perfect in 15 years because the next guy has pushed the physical boundaries out a little further. So, championships are everything because they're static.