I would stick to one icon. I am now level 98 at evoloton and not choosen to do the mountain on purpose. I have not seen any 100 players. The most I have seen is maybe a 99. There is no 100. Maybe if one would complete all of the traits in gold and the ones that all grayed out on the bottom that you would have to perform to unlock you could go up. In Live 2018 I never saw player past 98. In NBA Live 2018 I was a 98 with one extra sp point max out but could not use it for anything.
There is no clear word from EA how to be the best overall player. Do you have to complete season and win. Do you have to be level 25 on all three modes live run, live events, courts? Do you have to accomplish both icons to reach level 100.
I just did one icon and used all of my sp to get all of my evolution skills. Can you go back to your previous icon if you choose to do the other and are you back with all of your skills you acquired or you lose everything previously opened and can only have 1 icon complete at a time? This is the reason I choose to stick to my evolution at max and not test this out for fear of not being able to max out and be short on something.
Now when I say I have not seen level 100 I mean when you are standing in a lobby with other players and you see the number under the player in either 5 on 5, 3 on 3 or live events. You could have a 100 in your edit character screen but not in a lobby. This is the 100 I'm talking about, when you are in a lobby and see other real players. I think players are confusing experience at 100 and rating at 98 or 99.
If any one from EA can elaborate on this topic it would be appreciated...
I have found another Nba Live 2019 forum that has more anwsers.
https://www.reddit.com/r/NBAlive/search?q=Level%20100