You're correct about the 3 favourites, of course.
My main point though is that, if connections haven't made up their mind and in all likelihood won't until October, you're tying up money for 6 months in which time it's unlikely that the price will move significantly. With free bets and/or long prices this is fine especially if it fits your betting strategy but it simply isn't for me based on my experiences over a good number of years.
Every year is slightly different and everyone is old (and, no doubt, ugly) enough to go their own way but taking early (ie before a horse has reappeared) single figure prices isn't for me. A couple of examples:
Buveur D'Air was a best price of 5/1 in November.
Our Duke was a fairly skinny price before his first race of the season and went out to something like 25/1.
For sure Samcro backers got a good price this time but those who were in individual race markets had 6 months of will he, won't he and it will be exactly the same this time. Ditto Footpad. Until he, Min, Douvan and, maybe, UDS are back in full training there will be little serious discussion about Cheltenham targets and no meaningful clues until the Tingle Creek.