The A350 is certainly an interesting winglet. There is also the small flap right at the winglet. I really want to look into that more, as it appears to an attempt at a morph wing condition.
The A350, like the 787, will likely make large core, long lasting vortices, uncoupled due to the landing gear turbulence. So, probably forget about b0, and crow instability. Just avoid them, wherever they may end up!
Back to the turbulence, you will see discontinuities at the flap edges and wingtip, but this is not the rollup load vortex that is the issue at hand.