If that is the case, then I really don't understand the 5000 cap at all. With 1200 to be gained from pursuits and 988 from weapon skills (13 weapons * 19 rank-ups * 4 rating each), you'd end up at a hardcap of 4788 obtainable EGO rating? Where do the other 212 come from in your calculation?
They mentioned in the patch notes that vehicle skills are now going to reward ego levels. So that will add to it also.