Much smoother, but perhaps a bit detached due to the 3rd person
>Куда один, туда все!
This 1 sounds great, but loses some of the meaning. It could easily apply in a completely different context like where Soros goes, all of them go.
>Куда идёт один, туда идём мы все!
Perhaps cleaner without the "мы" which is already implied by "идём"
Perhaps another option, that although isn't as clean, but seems like the most preserving of context:
>Куда идёт один из нас, туда идём все!
"из нас" makes it into "Where goes one of us", so a bit less detached, and closer to WWG1WGA