Less relevant is not the same as irrelevant. I agree that the production-based battles in the US races were the most compelling electric racing this year.
However. Two US races in 2013? Empulse RRs doing parade laps waiting for competition to show? (okay, hyperbole .. Eboz and Turpin definitely are racing each other) Parker did try to offer a eSS award, until they were told to shove it by the FIM. Late notification to teams, high entry fees, small grid sizes?
Yeah, hard to see why there appears to be more interest in AFM than eRR.
Here's my tinfoil hat theories on no Size 6 this year:
1. If Zero largely carries over the 2013 bikes into 2014, Size 6 gives something to write about in 2014 / persuade 2013 owners to upgrade rather than just Bold New Graphics.
2. Zero spent some time this year moving into their new manufacturing facility, and bikes are (reportedly) on backorder now. Offering a substantially more attractive bike this year probably would not have meant more sales. However, in 2014 when they have the manufacturing capacity .. suppose the 2014 Zero S is $12000 ZF8.5, $14000 ZF11.4, +$1000 Size 6. I bet they would sell a few bikes .. and most of them Size 6. (Even though without the EV federal rebate, prices would be somewhat the same)
3. Hollywood Electrics is their biggest dealer, by far. Suppose an agreement was made between Zero and Hollywood Electrics to offer the Size 6 as a semi-secret upgrade. Hollywood Electrics gets a little extra cash, Zero gets some real-world development miles and a year of riding on Size 6 controllers (maybe they feel a little burned by Size 4 glitches?).
Remember when Luke on elmoto said something to the effect of Zero had spent $100k in labor getting the Size 4 working properly with the 2012 bikes? Harlan's a smart guy, if any individual could get the Size 6 controller working it'd be him, but I don't think the Size 6 is exactly a drop-in replacement.
4. Brammo started selling the Empulse R in Dec 2012, and the E1 in spring 2013. If Zero dropped a Size 6 into their 2013 bikes, the Empulse would be DOA (imo), or at least a very hard sell. Whatever acrimony may exist between the two companies - and certainly there are some individuals at Zero that feel it - I suspect / hope they recognize that killing Brammo does not make a stronger EV marketplace. (maybe my idealism is showing? Zero is a business, after all)
1 & 2 are plausible to me, 3 & 4 are kind of out there. In truth it may be none of these.