Noticed you for the first time about 19 mins in. @Monte is there about 21 mins in. You're both then in mostly until the last km or so.
This guy isn't pushing that many watts early on - clearly a good tactic to stay in the draft - I push big watts out the pen, but maybe when it's such a huge field you can hold a bit back early on and not go in the red?
Even when hitting 3 w/kg his watts are quite low (220 ish). He must be featherlight (just checked on ZP and he's 70 kg). The benefit of staying off the pies!!
Interesting thought on that as a tactic in large fields. I went out like it was a race and was breathing out of my #rse as usual for much of it.