how many of these guys (lafontaine, bullard) just scored a lot of goals because they didn't have good wingers to play with? both guys were later in situations where they had goal scoring support from teammates and put up very good assist numbers.
bullard, on the '88 flames, was on that crazy PP with macinnis and suter at the points, and loob, nieuwendyk, mullen, and others up front. he also centered tonelli and rookie brett hull that year. in hull's autobiography, he calls it the "what the bleep" line. i'm guessing you say a different word than bleep when you say it out loud. bullard had 55 assists, good for 19th in the league (he had 47 goals, 9th in the league; 11th in points with a career high 103).
lafontaine, of course, put up 95 assists and helped his wingers andreychuk and mogilny to career highs in goals. he also was a key cog on an excellent powerplay with those two, hawerchuk, and lucky beneficiary doug bodger on the other point.
i think it's similar with guys like sundin and modano. both might be more goals-oriented than your average center, but neither was "mainly" a goalscorer in the sense of a stamkos, say, or jeff carter or nieuwendyk, or ray ferraro (nice call on ferraro, iron mike). i would add ryan kesler to that list. in the summer of 2010, a switch flicked off in his head and he forgot that passing existed.