This is a disadvantage unless the other drivers are matched with a similar sensitivity. If the overall sensitivity is 94 db, there will be a massive disconnect between the 120 db driver and the rest (i am assuming the woofers play catch up, so the crossover will get more complicated to address the disparity between the drivers. Also, Linear at that db between what frequencies?
Most large format horn midrange compression drivers like Radian 850/950, TAD 4001/4003, Altec 288 etc, some JBL are all 4 inch voice coil. With horn loading they go to 105 - 110 db. Tad 4003 is linear from around 600 Hz to 18 kHz and also neodymium. But the best horns have the midbass downwards matching the sensitivity and preferably the impedance too to keep it coherent, and easy to drive with the same amp across both. The more disparate the driver matching, the less the overall ease and the flow.