As the Supreme Court per Tobi, JSC puts it in Nigerian Army v. Major Jacob Iyela [2008] LPELR-2014 (SC); [2008] 7-12 SC 35; [2008] 18 NWLR (Pt. 1118) 115: A case is not necessarily proved by the quantity of witnesses. A case is proved by the quality of the witnesses in the light of either inculpatory or exculpatory evidence, as the case may be. And so, it does not necessarily follow that because the respondent called four witnesses, they rebutted the evidence of the two witnesses of the appellant.
WITNESS INCONSISTENT ON MATERIAL FACTS
Thus, in considering and ascribing probative values to the evidence of witnesses, a Court is under duty to appraise it to see whether they are admissible, cogent, credible and probable. Thus, in the discharge of this onerous but very essential duty, a Court will be wary of crediting any witness who has either been so discredited or his so inconsistent on material facts in contention between the parties. It is for this reason that it is settled law that no witness who has given materially inconsistent evidence on oath is entitled to the honour of credibility and such a witness does not deserve to be treated as a truthful witness. See Ezemba v. Ibeneme (2009) 14 NWLR (Pt. 789) 623.
— B.A. Georgewill JCA. Stanbic IBTC Bank Plc V. Longterm Global Capital Limited & Ors. (CA/L/427/2016, 9 Mar 2018)