MaxWilson,
E9 bless would not help the boars as they have no armour but W9 bless would as the boars would then travel twice as far and so trample twice as many enemies (The extra defense is secondary). The smaller boars would trample size2 enemies and occupies the attention of others and so improve the survival rate of the Canute boars. Most opposition would break and flee before they can take down the Canute boars.
Furthermore, the Canute boars should be used in addition to the Druids, not to replace them. In the middle game summoning 10 Canute boars is certainly far easier than getting an EXTRA 4-5 equipped druids, so it is hardly a fair comparison (I would prefer to have 4-5 extra equipped Druids too
) The boars are more effective in combined arms than on their own and when used as such can be quite effective. They are also very effective defending castles.