That was a close to Grogu’s arc. The plot dangler— which is being picked up on, was the Darksaber/Mandalor/Bo Katan stuff.
But Grogu is a huge draw so they needed him back in and didn’t want to spend to long on getting to it so they piggy-backed it onto BOBF (which was already being shot on a shoestring budget leftover from Mando S2.)
The ending of season 2 was never going to be the ending because Luke taking the baby was always a mistake and was never going to work out.
Now having that shown during a totally different show than Mando is another story.