When LF and bantam chickens are pullets or cockerels they usually are very sweet in a group. However, we noticed our first 2 Silkies were being outgrown faster by the LF chicks that started to pick on the Silkie chicks to the point the Silkies were hiding all day instead of enjoying a daily romp scratching and pecking like the others. BOs are quite heavy birds and although owners say they are easy-going, my friend's BO was aggressive in her egg-layer flock and annoyingly broody which didn't add any charm to her disposition. But chickens are chickens no matter what and pecking each other is their thing. Even a large docile bird will take advantage of a smaller or timid breed if she can get away with it. That's why I don't get the common heavier dual-purpose breeds like RIR, BR, Wyan, Marans, Orps, 'Lorps, etc. The Mediterranean class (Leghorn, Andalusian, Ancona, Buttercup, etc) are great layers but they belong in their own group flock since they can become quite assertive and one of our Buff Leghorns was downright cannibalistic. We had a lovely White Leghorn that was great with the Silkies and timid Ameraucana but after age 3 she became quite aggressive and had to be re-homed. Watch your birds for signs of bullying and don't let the LF outnumber the Silkies. Bullying is infectious and can make other quiet birds mean so just watch for any offenders and remove/re-home them out of your flock. You may find you have quite a compatible group so just monitor them.