Well given we were losing in almost every knockout WC match in 2019 and 2023 when Kolisi was subbed it’s hard to make a strong case he was key to the Bok success.
To me he was potentially a destructive open field ball carrier, but Geraasmiss preferred the toothless running of Dud Toit. Kolisi hardly had any runs in the 2023 knockouts, which eliminated his best skill. As a tackler he is adequate, as a fetcher he is pretty useless. Not a lineout option, not an offloader.
And as a captain it always seemed Vermeulen was the man instructing the troops.
Perhaps his best contribution is singing the anthem where his body language is operatic…I hope his voice as well.