You have not told us what Fan Hub you bought, but you may not need one.
First, understand that the Corsair LL120 fans have TWO cab;es from each fan. ONE of these ends in a standard 4-pin fan female connector, and the fan motor design is the new PWM system. That connector can simply plug into any mobo SYS_FAN header on your new MSI mobo, and all of those headers can be set to use PWM Mode. You have not specified how many fans you plan for case ventilation, but the mobo you are expecting has five SYS_FAN headers. So you could easily power and control the motors of five LL120 fans from those with NO fan Hub or Splitter.
Now, the SECOND cable from each fan is for the RGB lighting devices built into the fan frame, and THAT is what the mobo's special JCORSAIR1 header is for. But there's more to it. That header can supply the power AND control functions for the ADDR RGB lighting devices in the LL120 fans, but there's only one such header and you have more fans than that. So you DO need an additional accessory from Corsair's line to do this plus a cable. Corsair has several controllers for use with their fans' RGB systems, so you need the right one. it is called the Corsair RGB LED Hub Model CO-8950020. It has SIX output ports for plugging in the RGB cables from fans, an attached cable ending in a SATA connector to plug into a SATA power output from the PSU, and a socket to plug in a signal cable connecting the Hub to that mobo JCORSAIR1 header.That last cable may NOT come with the Hub, so check carefully with Corsair how you can get it. Using this system you can distribute the control and power from the single mobo JCORSAIR1 header to up to six RGB lighting units in fans. If you have only ONE such fan you don't need it, of course. And if you do not care about lights, you don't need it either. You do NOT need the top-of-the-line Corsair Commander Pro for this. But shop around for pricing on the RGB LED Hub. I saw it offered from $20 to $60 new, and cheaper used. Actual control of the RGB lighting is done by a software utility that sends out signals on the mobo header, and I presume that utility is provided by MSI on a CD of utilities that comes with the mobo.