Those positions are thought likely to restrict the prolific nature of the pair, both of whom have moved south to Newmarket from their bases in Yorkshire.
Ex-champion Ryan Moore is also a big player when not required to be part of trainer Sir Michael Stoute's operation, while another former title holder, Kieren Fallon, is aiming for a seventh title despite reaching the age of 47.
Outside those five, both Joe Fanning and Luke Morris, the kings of the all-weather circuit, have the sort of hard-working, have-saddle-will-travel mentalities that could pay off.
That was the situation when Hanagan - a barely-considered 'no-hoper' - took the championship for the first time; to me, Luke Morris has a very similar profile and could be the surprise package. Stranger things have happened.
However, when it comes to Frankel, anything other than glory would be a shock.
The British Flat racing season starts with the running of the William Hill Lincoln Handicap, at Doncaster, on Saturday 31 March. On the same day, the Dubai World Cup, the richest race on the planet, takes place.
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