Is Crizotinib best choice with multiple brain mets(ALK+)following WBR? - 1269274

Greetings and grateful for your review and help!
Husb (now 62) had Stage1(<2cm) NSCLC-BAC in 2007, had LUL resected (definitive diagnosis!). CT followup and in past 1-2 years had lesions in each lung(<8mm) Then recently each 8-11mm. Before bx was accomplished-on 3/1/15 had left leg weakness and MRI revealed 7 brain lesions (most less than 5mm, one at 3cm, one at 6cm) Finished 12 rds WBR 3 wks ago, and lung bx result showed lung adeno Ca.ALK+ (no mention of BAC) CT/PET all neg for any other mets. Has been on Crizotinib for 10 days. Off Dexamethasone tomorrow. MRI done 4/20 and will discuss with rad and med onc on 4/23. He is doing quite well-though tired. No obv neuro signs he or I noting since the Dex initiated.
My question:-since Ceretinib is thought to be more effective against brain mets-shouldn't this be considered sooner? Was told that the protocol is to start with Crizotinib. Should we expect that the WBR is really going to offer the best therapy - and the Crizotinib is working to snuff out other microscopic mets?