Among the metros, used in the Yajurveda, we find seven which are marked by the epithet asuri, such as Gayatri asuri, Ushnih asuri, Pankti asuri. These Asura meters which are foreign to the whole Rigveda are actually to be found in the Gathas which professedly exhibits the doctrines of the Ahura (Asura) religion. The Gayatri asuri consists of fifteen syllables, which metre we discover in the Gatha Ahunavaiti (see p. 144), if we bear in mind that the number of sixteen syllables, of which it generally consists, is often reduced to fifteen (compare, for instance, Yas. Xxxi. 6, and the first two lines of xxxi. 4). The Ushnih asuri, consisting of fourteen syllables, is completely extant in the Gatha Vohu-kshathra (Yas. li), each verse of which comprises fourteen syllables. The Pankti asuri consists of eleven syllables, just as many as we found (p. 144) in the Gathas Ushtvaiti and Spenta-mainyu. Martin Haug, Essays on the sacred language, writings, and religion of the Parsis Pg. 271-2

Is this a big deal?  Is Haug basically just saying that the meters in the Gathas are the same as the meters in the Yajurveda?  

"These Asura meters which are foreign to the whole Rigveda are actually to be found in the Gathas which professedly exhibits the doctrines of the Ahura (Asura) religion."

Why does he even say this?  Wasn't it common knowledge that the doctrines of the Ahura (Asura) were foreign to the Rigveda?