The goal of this paper is two-fold. In the first part, I will offer a closer look into the nature of the instrumental case in Polish. In the literature, the instrumental case has been identified as a lexical, predicational, and a default case. In this paper, I will review the arguments for these distinctions, and argue that a default usage of instrumental is empirically not tenable. In the second part, an analysis of obligatory control constructions with the instrumental and agreeing case on predicates is discussed. It will be proposed that predicates that agree with their subjects are bare adjectives, whereas instrumental adjectives are situated within a DP with its head noun being optionally elided. As a last point, I will show how control mechanisms forbid bare adjectives in object control.