With the current fleet of A330, the best option is definitely more A330. He's most likely including the 77W into the mix for negotiation advantages?
Yes, he is including what is currently available in the market and B77Ws are coming off lease in big quantities as the original leases expire. Being a good businessman, he should look at all options and find the best one for MAB.
Get some interim a333s nothing more. Long term fleet they should plan for proper planes maybe the b787-9 or b777x if they plan to tap back to europe.
Yes, more A333s to solve the current aircraft shortage problems.
Longer term, the lowest cost is still the A330-900 as the transition cost is very low. They have the 6 A350-900 and these aircraft, as well as the A350-1000 may well be most suited for MAB's long term needs. But the big problem for them would be the cost. Just like B777X and B787s, buying the A350 will incur much larger CAPEX than buying the A330-900. So we will have to wait to see what kind of decision will finally be taken.