Whelp...Alexander is going to kick us all in the nuts

[Dagr81]

I doubt dungeons will require alexander gear. At least not untill a few more patches. But since you mentioned, let's talk about item level. This is one things Yoshie and co messed up with Alex.
No it's not about 170 being way too big. On the contrary.
Let's look at Coil item levels

Turn1 70
Turn2 73
Turn3 70
Turn4 77
Turn5 82

Now let's see the Ali G item levels

Floor1 170
Floor2 170
Floor3 170
Floor4 170

See the problem? I was able to get into floor 4 with the exact same gear I used to clear floor 1. The minimum of floor 1. I shouldn't have been allowed to do this. There are dps AND healer checks in the fights. People shouldn't be able to que into all four turns with the same minimum gear.

Simple put Alexandra test the players skill not their gear.

Same thing for Bismarck, but I think that one should have a minimum ilvl stated