[eligit]

the usage/name issue tho is dependent on very harmonically coherent or functional music.

if the progression is too simple or too circular.....the argument becomes moot.

so in that case....the simplest name is the best: E/A

if you HAD to consider it in the "key of A" you can just think of it as the V dominant chord (but lacking a b7).....but is that really needed?

also if you are in a simple rock thing like this....is a IMAJ 7 add 9 even worth writing as such?

in some gershwin or some beatles tunes with the melody as part of the equation intense debate might be merited.

in this simple series of chords......meh.