'Realists' suck. It's so anti Ni one could argue; Ni being their tert. Realists wouldn't try to change what they perceive as what is. That suits ISTJs more. ISTPs are introverted catalysts; more so than any other IxxP type - unless we are talking about a vocal Fi dom who is riding a horse somewhere in France -.How about the expert?
It's only skill because we've lived our lives saying " fuck it" sooo it's experience more than anything which establishes skill... That's why I think "Master" is the best because we learn every thing for and through the experience and then we are great finishers which in the end means.......Mastery! Or maybe "Dangerous Masters" would be best.