Why Guruvayur is omitted in the list of Divyadesams?

 I think, Guruvayur temple is not an ancient one like other Divyadesams and its Garbhagruh constructed in 16-17th century only to be destructed and reconstructed later several times.

Guruvayur came to light due to three invasions and destructions met during 18th century.

Many may not be aware that Dutch Ceylon occupied Tiruchendur temple, looted treasures, set fire and run away with the idol to ceylon in 1650. The current Tiruchendur temple is reconstructed in 17th century in Tirumalai Naicker regime.

Once tasted looting, Dutch Malabar did the same thing in 1710 to Guruvayur Temple. It looted treasures, destructed Gopurams, Shrines and set fire.

This is followed by Hyder Ali 3 decades later.

And again his Son, Tipu avoided destructing it by collecting huge sums of money from Temple administration.

Guruvayur is popular and cornered public attention due to these invasions.

Other Malai Nattu Divyadesams, could avoid these. This is my view and may not know locals version, which must be authentic.