Just want to clarify.  If a JC player (Junior) has High potential in a  category, will he improve at a more rapid rate than a normal freshman with High potential?  He only has 2 years to reach that potential as opposed to 4?

No, he'll improve at the same rate.  Improvement rate is tied to WE, playing time, and distance from cap... that's it.

so if a JC player is listed with high potential, does that still mean at least 20 points of improvement?

Here's two JuCos that I've had:

Orsini (15/27 games started, 19.4 min/gm as a junior; 29/32 and 17.9 as a senior):

	A	SPD	REB	DE	BLK	LP	PE	BH	P	WE	ST	DU	FT	TOT	NET
St-Jun	54	68	41	78	1	29	64	72	65	57	71	42	C+	642	472
Junior	64	80	43	84	3	29	68	81	76	63	83	50	C	724	528
St-Sen	65	80	43	85	3	30	68	83	79	63	79	50	C	728	536
Grad	71	87	45	90	7	30	70	89	86	69	88	54	C	786	575

Thompson (26/27 games started, 18.0 min/gm as a junior; 28/32 and 19.3 as a senior):

	A	SPD	REB	DE	BLK	LP	PE	BH	P	WE	ST	DU	FT	TOT	NET
St-Jun	55	59	80	54	59	62	46	12	17	78	62	5	C-	589	444
Junior	65	69	89	63	70	69	55	12	17	82	77	12	C-	680	509
St-Sen	68	69	94	68	70	71	57	13	18	82	80	12	C	702	528
Grad	72	74	97	73	77	75	63	13	18	86	86	19	C	753	562

They're less likely to cap out (the same way that a 4-year player that gets drafted after his sophomore year is less likely to cap out,) but they have the same amount of improvement possible as a 4-year player with the same rating + potential.

You'll see from my examples that if you've got a strong WE and playing time, you can still get 150 or so points of improvement in the two years.

Thanks for the info.

Any time.