“The assessment of witness credibility and reliability is not an exact science. There are many considerations relevant to the weighing and assessment of these matters. These include a consideration of the witness’s coherence and logic, corroborating testimony by other witnesses, and corroborating documentary evidence. Other considerations include a witness’s willingness or disinclination to make admissions and the extent to which they are clear or evasive. In addition, the witness’s relationship to one or both parties and whether the witness has a vested interest in the case are also relevant considerations: see for example, Jayawickrema v. Jayawickrema, 2020 ONSC 2492 (CanLII), at para. 28.”