I did this analysis of Haydn Piano Sonata in Eb Hob XVI:49 as a way of exploring development. Clearly from a Schenkerian perspective, development prolongs. I think this isn't as interesting as understanding how development prolongs. It exhorts by shifting tonalities. It coerces with rhythm and motifs which are repeated. And it disrupts - particularly and wonderfully in Haydn. Rather like the Lachenmann, there are moments where mini-prolongations are perceived, and mini-disruptions occur. But here there is a clear sense of movement(helped by the increased coercion - would the development be the same without that insistent alberti bass?). A sense of progress. An illusion of progress perhaps. And the illusion is borne out of the fact that some essence is prolonged as a result of all this activity, but we don't get to see what it is until the recapitulation.