In reference to Tilly, I honestly don't know what a Tilly bunker looks like. See Newport, San Francisco and the old BB. They are all very very different, so I don't have a problem with the Rees bunkering on BB.
Neither does Rees. From what I've been able to figure out you can divide his architectural career into three distinct period or styles.
The early style when he partnered with George Low & Peter Lees, courses like Somerser Hills, Essex Co, Shackamaxon, Bluff Point and early Quaker Ridge, the courses (and bunkers) are a little more angular, kind of old fashioned, featuring unique mounding.
His prime years, which is a little more naturalistic and free flowing, fairly soft lines, a lot of obtuse angles, courses like Winged Foot, Fenway, Baltimore, Fresh Meadow, Newport and Phila Cricket. Those bunkers are probably considered Tilly's protoypical bunkers.
And then later style which is of a bigger scale and with an usual irregular outline. There aren't many of these courses due to the Depression. Other than the Red and Black perhaps the only other course in this style is or was Ridgewood.
SFGC's bunkering is Billy Bell.