I am getting confused about how people use trisate buffers on SPI lines. Are people only supposed to use them if the chip itself does not have a tristate output on the MISO line only? Also, you could effectively use the 74XX series of chips as a mux, correct (tie the OE to the chip select)? It would, in turn be a kind of a sketchy or poor man's version of multiple fan out buffers or a mux for the MOSI line or clock?