Do people suspect Hungerford will just flip this once rezoned? Are they known for that?
To the point about requiring a concurrent DP, I think you will see massive push back on that one. DP drawings are expensive, a very big investment to make in a project that still has the uncertainty of whether it will get zoning or not. Plus, DP's can legally be cancelled or expire, but zoning is in place forever (unless applied for by the owner, or in rare cases, Council chooses to rezone your property through their own initiative). So, if DPs were made mandatory, I can see two loop holes:
1. Just get a cheap rendering done showing a future buildling, see if that passes the test, get your zoning, and it is no different than the current system.
2. Pay for a DP that just wows everyone, get your zoning in place, and the next day cancel it, or just let it expire. Same as the current system, but adds a substantial cost to the process, thus requiring developers to go even BIGGER with their zoning asks to justify the costs....