Doesn't look opaline to me. Also, I'm guessing he could also be recessive pied due to the yellow between his wings and lack of an iris ring.
And yes, your chicks will be either SF of DF spangle.
You know you might have too many budgies when you're not sure if you've remembered them all!
Charlie - Cinny - Dante - Gidget - Jimmette - JJ - Jules - Mo - Ollie - Peanut - Penny - Pie - PJ - Pockie - Sally - Simon - Snowy - Song - Sora - Spang - Tommy