Holly’s Birthday

Can anyone explain as to how Holly was born during the time frame that Will was presumed dead for two years, given that Deimos was on at the time that Nicole had helped Chloe to give birth to Holly, given that the two years that Will was presumed dead for was when Sonny had launched a take down of Deimos, & that Daniel Jonas was killed by Eric & when Eric had done that, was Will there for that, I can’t see Will being their when Daniel was killed, now was he?