Can a local tumor in the lung spread to develop bone metases without affecting the rest of the lungs on xr?

Yes: Small/oat cell carcinoma of the lung can disseminate widely in the body while the primary lesion may be too small to be detectable.

Lung cancer: Obeys no rules . Direct spread to bones without hilar or mediastinal mets is one broken relatively freqently!

Yes, it can: This happened frequently especially in small cell lung cancer, but also in non small cell lung cancer . A "localized" tumor can spread and metastasize to the bone or other distant organs-without affecting the rest of the lung.