Yes. The sale of KBUC was at the tail end of 1988, followed by putting the AC format on FM and Tejano on AM. The Spanish language soft (and horribly focused) format did not work at all on the big FM channel, so they figured out the two formats should be inverted.
Putting such a format on FM was quite radical thinking, as the thinking at the time was that a mass appeal format in Spanish on FM would not work. So we found highly under-performing stations on FM in Spanish... like KLVE in Los Angleles... because owners did not see the potential and programmers applied the wrong formats.
San Antonio in 1991 and KLAX in LA in 1992 proved that idea to be wrong, and FMs in Spanish began popping up in many markets.