Originally Posted by BartWest:
“I can't see how JB will fit in Torchwood. Apparently, apart from his role in Arrow, his character, Malcolm Merlyn, will appear in the other CW series as well.”
I remember it being said that he had requested time off from Arrow to do the 50th were they to ask him, which obviously they didn't (though he did do the Five(ish) doctors), so that, along with his known passion for a Captain Jack return, seems to prove to me that he would do his best to work around that if either Torchwood or the main show came calling.
I'd also say that, as someone who watches Arrow and the other CW DC shows connected to it that as far as Arrow goes, he sort of comes and goes as a character, and isn't a exactly a character the show can't function without, to the extent that, if he was offered a new series of Torchwood, and asked the makers of Arrow for a year off, they could easily do it without much disruption to their show (not to mention they could then make a big deal of his return the following year). As far as the other shows connected to Arrow go, again as a watcher of those shows, I know that when cross over characters from one show into another, it's usually just for a one episode cameo, or two parter at most, so that really isn't a factor.