i think the partner airline part is irrelevant, as ime the partners have the same availability as matmidas far as your question, sometimes seats do open
Does el al release more award space to partner airlines closer in to flight time?
IME:On most routes, No...They release in advance, and usually if nobody cancels seats don't open up.though I've noticed quite a lot that BKK-TLV is a route they don't release any business seats a year in advance (unlike HKG-TLV where you can find 5-9 business seats on almost every flight a year in advance), but closer to the flight they do open up 2-3 seats per flight on that route. I'm not sure what the reason is on that.