First, I question the validity of any list which has "Last Night I Dreamt" in its top five. Good song, but better than "Heaven Knows I'm Miserable Now", "The Boy With The Thorn In His Side", or "Shoplifters of the World Unite?" Better than "The More You Ignore Me"?
But! Granting that these are, indeed, the five most beloved Morrissey singles, I would just counter by pointing out that in a Marr v. Street contest, the next, say, 50 songs would be dominated by Marr. Street had about half a dozen glorious tunes that were as good as anything Marr wrote. His filler album tracks and B-sides are mostly pretty average-sounding. Whereas even the least-enjoyable album filler or B-side composed by Marr is still mostly outstanding. The fourth-best track on "The Queen Is Dead" easily trumps the fourth-best on "Viva Hate". So, yes, I think he is a poor man's Marr. A couple of gems, some passably decent stuff, and the rest is unremarkable.
Street was Morrissey's second-best producer, though (behind Mick Ronson). I'll give Street enormous credit there. With Street providing decent songs, bringing in the the most accomplished guitarist of Morrissey's solo career, and upgrading the results in the studio, he practically was Johnny Marr, at least for an album and a half. He could have kept The Smiths' formula going for awhile, which part of me wishes had actually happened. I think of songs like "Lucky Lisp", which to my ears is below-average backing music transformed by Street into one of the highlights of Morrissey's career. Street knew how to polish a tur...turrriffic song.