Looking at the thread title in a slightly different way, one song that stands out as lacking lead guitar from the Dire Straits era is Portobello Belle, which I think is the only song from the first two albums with the original four man line up which doesn't feature any true 'lead' guitar parts. I assume Mark plays the resonator guitar on this track, so he is playing the main guitar part in a strict sense, but he doesn't play a solo or even any fills so it is essentially a rhythm part throughout the song. I don't think Wild West End from the first album has a guitar solo either but it does have Mark playing lead fills throughout the track so the difference is not as noticeable. Portobello Belle, on the other hand, is unique in its era for lacking prominent lead guitar parts.