I suppose making it to the final is what you need, olivia/Alex the previous year had lots of piblicity afterwards and kady McDermott (maybe more than cara/Nathan in the long run) but still Alex3 needs to couple up with alex to get through and Kaz and Josh will want to get to the final.
Montana had lots of publicity afterwards last year because of her personality but Kaz doesn't have that in the same way so if she wants to do well from love island she needs to come top 3.
I don't think anyone this year will do as well as people in the last 2 series apart from maybe Dani and Jack as I think their personalities aren't as strong as people like Montana, Olivia both years, Chris, Kady etc.