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... ac moderato duci, adprobavit, electus quem contubernio aestimaret. Nec...

electus...aestimaret, "(Agricola) chosen (as someone) whom he (Suetonius) consideret/judged (suitable) as a tent-mate [dat. of purpose]"; "aestimaret" is imperf. subj., a generic subj. in secondary sequence after a verb, "adprobavit," in past tense.