Considering Count Binface got 26.93% (i.e. +2.13% Vs. the previous combined), the opposition did in fact converge on him. It just so happen that in Clacton the opposition is tiny, it is a very right wing area - which is why Farage picked it.
So I'd not consider +2.13% over the previous combined opposition a bad result, quite the opposite. Unless you believe previous Conservative voters would pick Binface over Farage, which to me seems highly unlikely.
All numbers from:
https://en.wikipedia.org/wiki/2026_Clacton_by-election#Resul...