Re the A380...
Short answer: money also the A380 is a fat, heavy pig, so anywhere it touches the ground has to be reinforced over and above the existing weights such as B747/777/787. That's alot of digging up and filling.
When Pier 6 was built, the A380 hadn't flown, they put in a massive heavy duty stand... Gate 110, which is at an angle at the end of the pier. This was the only jetty serviced A380 gate on the airport. (Remote stands, 170's and 200's will all take it).
As it happened only Emirates regularly operates the A380 into Gatwick and it was only licensed for three daily flights... If the run extras, then Emirates have to use other aircraft, usually B777s.
EasyJet growth demanded more gate space, and getting 5-600 people over the bridge for one flight three times daily was eating into gate room space at all three flight waves (they used to use the gate rooms for 109, 110 and 111 for the Emirates, and whilst boarding it on 110, the other two gates could only be used for arrivals, which is limiting as Emirates trumped anything else. Bit of a stand planning headache
)
Since 2014, Pier 5 has been undergoing redevelopment, and there's a tricky junction between the old BA domestic gates, 551-557, and the refreshed pier, 559-574. The solution, and probably at Emirates expense/demand, 557-559 was dug up and strengthened along with all the taxiway routes leading to it, a gate redesign with two more jetties and a ground layout redesign for all the shyte that the A380 needs. This opened November last year and work to 'correct' pier 6 and add in a further 5-6 lounge/jetty gates where 110 used to be in line with the rest of the pier. Inside will probably allow for more toilets and another couple of shops.
The only other A380 that regularly visited was the Hifly ex Singapore one that Norwegian used to charter to cover their Dreamliner engine destruction program. Given that they lost £15 on every single seat on it, that didn't happen that often. So as an aircraft, Gatwick can easily service them, but the only customer demand is from a single airline.
One of the benefits of the B777-10 with its folding wing tips (also the A350) is that it will fit onto any stand that the B747 will, and that's over half the jetty serviced gates st Gatwick, so that's the current future covered