Here’s where I have issue. I don’t know of a single product in any industry that is the undisputed absolute BEST.
Paul, if you've not yet had a chance to experience the DAVE or Mojo, you should be skeptical. Some of these claims being made without question border on the absurd and even fanatical but that is to be expected with any appreciation thread here on Head-Fi. We are, as audiophiles, after all very passionate as a group and so such superlatives as "best ever" are not unusual statements made here and on other forums. I'm sure we each have uttered those words about some piece of gear at one point or another but as Beolab has stated, these statements should be taken with a grain of salt. As so commonly said, YMMV.
As you stated, with Tyll's Big Sound 2015, some very big names could not blind test the difference between a Schiit Yggy and an Antelope DAC and so there are many on Head-Fi that are probably already skeptical of many claims regarding the DAVE or Mojo. However, those of us who have been in this hobby long enough and have made our own comparisons, even blinded, know how much better certain DACs are over another and what an impact it can have in a digital system and as an ownder of a Bricasti M1, I'm pretty sure you're part of the group that believes this.
For me, I had my own doubts about the DAVE, let alone the Mojo. For a summit-fi DAC that is just now being widely released, to have nearly 1,500 posts already on Head-Fi is quite unusual if not unprecedented. It's a hype train similar to what I witnessed with the USB Regen when it first came out but the difference is the USB Regen sells for $175 while the DAVE sells for $13k which is what makes this hype train all the more remarkable. I actually bought a USB Regen based on all the hype without having first experienced one and while it does make a small difference in my system, at no time did my jaw drop or tears start to stream from my face as some have described. And so you can imagine my skepticism about the DAVE, especially as I was already a very content owner of a TotalDac d1-monobloc, a DAC I had regarded as the best headphone DAC in the world.
Regarding Chord products, I am fairly new to the fold. Having had a Hugo at my disposal for a full summer, I found myself not reaching for it very often as I never found it that engaging compared to my Bricasti M1 or as convenient as my portable Sony ZX2. I was part of the group that considered this DAC more hype than substance and so in no way would I consider myself a Chord fanboy or devotee. It also didn't help that there were so many arrogant statements being made about this DAC. As you stated, when something sounds too good to be true, it usually is. At the same time, where there's smoke, there's usually fire and there sure is a lot of smoke being made about the DAVE. Enough that you need to experience it for yourself so you can judge it for yourself.
I've tested a lot of gear this past year and having owned or spent quality time with a lot of DACs including a W4S DAC 2 DSD SE, Auralic Vega, Schiit Yggy, PS Audio DirectStream, Hugo, MSB Analog, Bricasti M1 and TotalDac d1-single/dual/monobloc, I feel comfortable in knowing what I am looking for for myself. My philosophy is that if it takes days or even hours to hear the difference, there isn't enough difference there. Usually, I know within minutes or within a few tracks and that is what happened with the Bricasti M1 and the TotalDACs. The differences were stark and these are DACs you could blind test with. It hasn't happened with any other DAC again...until the DAVE. But just because this has been my experience or someone else's experience doesn't mean it will be your experience.
I think you should forget the talk about lack of noise floor modulation, galvanic isolation, etc. They'll be important later when you try to explain to yourself what you are hearing. I think the only value of all of these comments is that the DAVE (and Mojo) are worth a personal audition.