Is that actually true about JCs comment though? BBC is saying he hasn't said anything. I've only read it on Social Media. Today programme was speculating that Zarah put forward her announcement as she wants joint leadership but Jeremy wants it just to be him. Who knows!
A forceful left party putting pressure on Labour is a good thing. They'll hopefully pull Labour back to the left to keep the votes and maybe drag Conservatives back towards the middle too, instead of Labour and Conservatives drifting right to compete with Reform.
I'm left leaning, but would prefer both Conservatives and Labour to be in the middle ground because that's how the country runs best. They need a far left party to balance the far right to keep the big two in the middle (and Labour and Conservatives need new leaders and purpose).