Link Controller Question

From the Steps of Configuring Link Controleer is : Creating the default gateway pool & Defining the physical connections to the Internet

 

lets's assume we have ISP1 & ISP2 , i will use :

 

"default gateway pool" as default route to the Internet ( This will contain next hops routers IPs )

 

Also at the configuration we will create Links that will contain Router IP & UPlink Ip as well )

 

 

what is the need for Creating Links , i beleive that Creating Default pool & using it as default Gateway was very sufficient to provide Link Load Balancing to ISPs ?