No one sustains this type of pitching as a starter, especially given ESan's k/bb rates. 90%+ LOB (vs a career mark of 73%) .143 BABIP (vs career of .282) Clayton Kershaw, in his best full seasons, had marks of 81.6% and .250.
1. Different defensive data sources. 2. Both. Sample size of defensive data takes so long to accumulate due to limited opportunities that there often ends up being big discrepancies.