I think this is too generous. The architecture previously supported the big move in the site plan by matching it with an equally bold architectural move. A big 12-storey wall running along the south side of the site worked because the architecture embraced that as a feature and made something of it. The new scheme, as you've described it, is struggling to "reconcile" something (the "unusual scale" of the 12-storey slab) that the previous scheme embraced and therefore was able to make beautiful. What we're left with has nothing to say architecturally except "sorry."