If the A5 Sportback and S5 Sportback come to the States and are offered with a manual transmission, that may be Audi’s midsize four door with a manual transmission. Given that the b9 A4 and S4 will not come with that transmission option ...

Not redundant at all. The A5 has a wider track than the A4. This will make the A5 Sportback the more athletic one compared to the A4.