Not so EEO are quite happy to eat raptors I,m pretty sure that would scare off buzzards, my understanding is that they are also very territorial and have no tolerance for any other raptor in it's territory.
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It mainly feeds on small mammals in the 200-2,000 gram (0.44-4.4 lb)[7] weight range, such asvoles, rats, mice and hares. However, prey can be killed up to the size of foxes, marmots and young deer (up to 17 kg/37 lb), if taken by surprise.[8] The other significant group of prey is other birds and almost any type of bird is potential prey. Common avian prey include corvids,grouse