JFP was had been ousted from Santa Barbara in 1990 after the Dobsons won their legal battle allowing them back into the studio.
In the year prior to JFP's arrival, GL lost five of its major actors -- Kim Zimmer, Robert Newman, Grant Aleksander, Beth Chamberlain and Michael O'Leary
So, when JFP arrived as EP at GL in spring 1991, she really had a lot to prove about her talent and her abilities as an EP. And rebuilding a show that had just lost five of its main characters was no small task. But she set about to do this by focusing primarily on the existing characters on the canvas, doing things like moving Ross Marler from supporting character to a lead character. She also brought in a few new characters like Eleni to really stir things up with the existing ones.
As we all know, she did a fantastic job with that rebuilding and refocusing. Got great acclaim. Marlena de la Croix did a hugely complimentary column which JFP framed and put on her wall.
JFP was very resistant to letting any of those five actors return since she had so successfully rebuild the show without them. But with Luke and Laura set to return on GH in October 1993 and the network demand she somehow counterprogram that return, JFP decided bring back Robert Newman. JFP knew him from his short stint on Santa Barbara in 1995. And of course, she also got Marcy Walker to join the show as Tangi Hill at the same time. Josh and Tangi were her answer to Luke and Laura.
Next one back was Michael O'Leary in spring 1994.
Grant Aleksander left in 1991 because he needed time away to grieve his parents deaths. But when he was ready to return to acting in 1993, he went to AMC instead, playing Alec MacIntyre, who bedded Haley Vaughn and her mother at the same time. No idea if Grant approached GL when he was ready to return to acting before going to AMC, but I suspect JFP would have been resistant to letting him return
Kim Zimmer made it clear she wanted back in, -- even was on some talk show dropping not so veiled hints she wanted back -- but JFP absolutely refused. Ultimately, she agreed to let Reva come back as a ghost for a short arc in May-June 1995. I suspect that refusal to let Zimmer come back may have been a main reason JFP was fired around the time. The first thing the next EP did was sign Zimmer to a long term contract.
As for Vincent Irizarry's return in July 1991, that was already in the works when JFP arrived. According to Vince's Locher Room interviews, that return was almost a year in the making. I suspect it was P&G and the network that ultimately decided Vince should play a new character rather than a back from the dead Lujack. JFP may have weighed in on it when she got there, but the decision was made above her.