"The logic that Iberia is the same management under IAG would mean Aer Lingus and Vueling should also be in T5, but it's obvious why they're not. "
If T5 was bigger they'd be in there as well
"BA have been playing second fiddle since the odd decision to put the Spanish head of a low cost airline in charge of one of the most respected full service airlines in the business."
On 12 October 2020, it was announced that Sean Doyle, CEO of Aer Lingus (also part of the IAG airline group) would succeed Álex Cruz as CEO. And IAG is now 25% owned by Qatar. I'll pass on commenting on "most respected"..................