>>Is FGEN the only one currently targeting CTGF for fibrosis?
To my knowledge, yes.
CTGF is clearly intimately involved with fibrosis, but I wouldn't call it a magic bullet. Fibrosis is very complex and there are weird feedback loops with e.g., TGF-beta.
The FGEN drug was able to reverse radiation-induced lung fibrosis in an animal model - as far as I know that is the only demonstration of reversal of fibrosis in the literature.