As for David, Roseanne Conner was more or less a mother to him, despite the fact he was dating her daughter, so it would be surprising if The Conners went the entire episode without Galecki mentioning it at some point.
With potentially only one episode for David to both eulogize Roseanne and continue to work out his co-parenting situation with Darlene, it’s a shame The Conners crew couldn’t lock him down for more episodes on the outset.
At the moment, that feels like a big IF, considering how the political tension behind Roseanne Barr’s firing has seemingly split its fan base down the middle.
Of course, with The Big Bang Theory ending, Galecki might be willing and able to commit more time to the series in the future, assuming the spinoff does well enough to get another season.