Analyst Benjamin Cowen suggests the current ALT/BTC rally, driven by ETH's strength, is a temporary summer phenomenon likely to end by late August. He forecasts a reversal in September-October, with Bitcoin Dominance (BTC.D) rising and ALT/BTC pairs potentially making new lows. During this period, ETH is expected to outperform other altcoins, as indicated by the weakness in ALT/ETH pairs.