He doesn't prove anything yet and asking that price is to much for those team that's why now his old team let him go wherever he want since for sure they are also doubting about their future if they let Teng got what he wish from his team. And also Fajardo deserves that salary since he bring championship to SMB then also he take home a lot of achievements so for sure no people will question him on why he get a lot of money from SMB.
Teng isn't as good as Fajardo; his style of basketball is still predictable, and there are probably many potential stars who could generate the kind of production he has, and perhaps even better. These days, some players are demanding too much, possibly comparing their salaries to what their friends playing overseas are making. However, you know, we are in the Philippines, and a PBA player can only earn a substantial salary if they are an import or a star like JMF.
That's why he can't demand higher fees to the team maybe he need to get more trophy or accolades to his team before he can ask that. But it seems that no team can do that since he's not a superstar level like Junemar that's why he became a free agent right now. If he's belief that his worth than that maybe we cannot see him play on PBA anymore.
If we check his stats https://www.flashscore.ph/en/player/teng-jeron/d8S4K9a1/ this is decent but not worth the price demanded.