The maintenance of a Buy rating by Rosenblatt suggests a positive outlook on Viavi Solutions, indicating confidence in the company's fundamentals or growth prospects. However, the reduction in the price target from $15 to $13 could reflect adjustments in valuation models, possibly due to revised earnings expectations or market conditions. This mixed signal might lead to a neutral short-term impact on the stock price as investors weigh the positive endorsement against the lowered expectations.