Disconnect between A and B stock evidences a problem.
It shows that you can't trust the rally. SMART investors would be buying the A stock, and selling the B stock. Why is ANYONE buying the B stock at $4.00+, when they can buy the A stock at $1.40.
Unfortunately, my broker can't find any B stock to short right now. But I just bought 5000 shares of A stock today, at $1.41, with the intention of finding 5000 shares of B to short, soon (hopefully), and locking in on an almost guaranteed arbitrage profit.
Historically, the A and B trade MUCH closer to each other. One thing is for sure: Either the A is dramatically undervalued...or the B is dramatically overvalued.